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Re: FINISHING: Capturing Baselines, and Adjusting Alarms

 

There are lots of reasons.

1.? I personally don't yet understand exacty how to work well with Github
2.? Your code did not have bMP280 for several days due to the simple fact you were doing your best to even FIND the device.? ?
3.? During that time we pursued other code.
4.? You're a professional programmer and use things that dumb people like me have more trouble understanding.
5.? Dumb people like me sometimes better understand simpler code that has more descriptive comments.
6.? We're all doing the best we can.? ?I spent three hours the other night helping get the BMP280 working in YOUR CODE -- so, PlEASE RUN WITH IT!!!

We need something that does what the FDA is going to want.? As we go along, we udnerstand better and better what that might be.? ?Therefore mistakes will be made along the way.? ?I just got my TRANSDUCER/POWER SUPPLY board working -- but still don't have the right part for one of it.? ??

MAKE IT WORK FOLKS!!!
Thanks for all of the efforts everyone is making.? We are very close to the finish line, folks.? Please keep going.

gordon


Re: Transducer board // power supply

 

For the first time, i have a working "transducer board" / power supply that can handle both AC and battery inputs.
It isn't perfect, it is just all I have at the moment and a lot of blood sweat and tears went into getting even that.
the photo is attached (you can see that I had some "issues" such as limited parts availability, unwillingness to risk parts, goofs, etc)
The Schematic is attached -- and yes, you will have to pick the values off the photo of the board (will do better later)
In the built board, I have only so far put in ONE of the two trickle charging parallel current sources.? ?No matter.??

TWO ISSUES:
1.? The Adafruit board works? (0x77) but I could not get the KeeYee BMP280 board to work.? Why?? I dunno.? ?Wrong bus voltage?? Dunnno.? SEND 3.3 VOLTS TO THE I2C BUS please -- the Ashar 0.1schematic/Stapleton 1.0 Board use 3.3 volt bus.? ?

2.? Dumb me, the AC Power green led stays dimly lit even when the battery is having to run the thing.? ?May have to put a resistor in parallel with the Green LED to get it to quit.? ?Will work on that later.??

This is of course optional.? ?I was instructed to add battery backup (I'm a volunteer, remember?) by the UF Team -- so I did.? ?Now it turns out tht the FDA will accept merely having a commercial UPS running the thing.? Duh!? ?We didn't know that until a day ago.

No warrntees; no guarantees; use any of this information at your own risk.


Re: FINISHING: Capturing Baselines, and Adjusting Alarms

 

Mike.? ?

You're a maufacturer.
UF is a design team.
I'm a volunteer.

UF will do whatever it takes to get this to the FDA as soon and as likelly to succeed as possible.
That's THEIR contribution.? ?

They don't provide liability insurance,? and they have ONE GOAL:? get it to the FDA.

YOU have different capabilities and different issues --- please do the best that you can.? ?I'm tryng to accommodate whatever Marcelo / etc need.? ?
Gordon


Re: #ExhalationValve #ExhalationValve

 

Thanks!!? ?I was surprised to see that indeed there is a difference in the way Rainbird does it.? ?The Team at UF has measured the expiratory resistance across the ORBIT valve that I modified and found it apparently EXCELLENT -? and this requres NO 3 D prnting and NO machine work --- but you ahve to have a valve that can be modified.? ?So will work for some and will not work for others.

the UF team (I'm *NOT* the head) will pick whatever they think best for their shot at an EUA.? ?I don't have a dog in that race;? I'm here to help as much as possible.
Gordon


Re: #ExhalationValve #ExhalationValve

 

Hi Mark W.

AJ and another on our team have done that immediately after they saw this issue and started it up again.? Just heard from them that its at 325K cycles and still going fine.? Thanks for the suggestion.

To David and Gordon: We were going to test the sprinkler valve too in the exhalation valve as suggested by MA.? We don't have the right parts for that since the rain bird can't be modified as suggested from what we've read here.?

Jim


Re: FINISHING: Capturing Baselines, and Adjusting Alarms

 

Please stick with the 2 x 16 as the primary supported display as this is what I have laid out for my board and the device I had been attempting to secure for volume commitments.? I believe this was the display that was the final consensus a week ago.

If the software must be submitted then I will send my IO used to simplify routing and make a compact designed for manufacture board in a few minutes. I suggest that you have two files in the hardware abstraction layer where port definitions are made. You can then conditionally assemble either image for either board or easily add support for other / future boards.
73
Mike N8WFF


Re: FINISHING: Capturing Baselines, and Adjusting Alarms

 


What is the reason that Software Developers collaborating with this project are not working on the baseline in CSSALT GitHub?
Please be free to openly criticize if there is something wrong there the same way I did so about the other Software.

If we had all collaborated with that baseline, for example, had integrated the BMP280 sensor, we would have all these requirements being easily implemented.

Thanks,
MV


Re: FINISHING: Capturing Baselines, and Adjusting Alarms

 

Forgot to attach photo? (oops!)?
Note you're looking at the BACK of the cover.? ??
Will cut a hole big enough for the 20x4 to fit into.? ?Can bezel in the 16x2 without problems.?
I'll try the 20x4 and if I can get the ONE that I have to work, I'll tentative insert that one on the cover.?
If I can't....then the 16x2 goes in.? ?Let's get this finished!

Gordon


Re: FINISHING: Capturing Baselines, and Adjusting Alarms

 

Just For Your Information.? ? Attached is a photo of the BACKSIDE of the cover, and the box that i got from Home Dpot.? There wern't many choices.

The battery was glued in place (for better or worse)? ?2 days ago for stability.

I've picked a location and will cut a rectangular hole for a 20x4 display --- With a bezel a 16x2 can be accomodated.? ?We can caulk or RTV for waterproofing.? ? I finally have ONE? ?20x4 display....


There is enough room above the battery to allow me to install 4 buttons.? ? I tried to accomodate the physical layout of the Ashhar v1.0 board, while also allowing what I'm calllng the Stapletonv1.0 board (which Dr. Stapleton kindly layed out, had made, and BUILT 5 copies of, to the Ashar 0.1 schemtic -- and it WORKS) -- the displays may be on wires to make these work, doesn't matter for getting through the FDA.? (Matters if youre building 5,000!)

The only purpose here is to let the software FINISHERS? (not developers, FINISHERS!)? know roughly where I' going.? ?Somehow we have to FINISH this project.? ?The little transducer board/power switcher will fit on a side or somewhere.? ?i will likely mount the main board to the cover of the case, on standoffs ( I got in an assortment)?

First I have to go build the transducer/power supply board....so that's what I'll be doing for the next hour or so....)
Time to FINISH this project.
Gordon


FINISHING: Capturing Baselines, and Adjusting Alarms

 

Folks, it is time to FINISH the software.??
This is Saturday, and I plan to build a physical hardware today,?
The team at UF needs a freeze on the hardware and needs to have something that WORKS.? ?The FDA requires FAR LESS testing than we get done very single day now.

We have now conquered the I2C issue, whether optimally or not.
Now in my view we only need two more things:
(1)? SOME WAY for the user to be able to notify the software "Now is the time to gather our baseline pressure, or zero this or that"? -- as needed for sensors.? ?Because we can't just assume that on a restart that the patient is disconnected, and the clinician may require a change in a pressure, or a timing, or add positive-end-expiratory-pressure (PEEP) that CHANGES the baseline pressure that our system sees in the BMP280.? ?So we need a way to allow the user to indicate? "now is the chance to grab your baelines for this or that"

(2) SOME WAY for the user to modify the Alarms.? ?I don't really care how fancy, and I don't think the FDA cares either.? ?And we don't have infinite memory available.?

-- The LOW PRESS alarm needs to fire if the inspiratory pressure never increases above 3 cm above baseline during inspiration.? ?(The baseline will CHANGE if the clinician adds more PEEP mechanically.)?
-- The HI PRESS alarm needs to be in some way adjustable.? ?Find a way.? Default is 35 cm H2o above "baseline" and range is probably 20-60 cmH2O
-- The TIDAL VOLUME needs low and high alarms and they need to be adjustable? in SOME WAY-- either in reference to what is happening, or even more simply (and QUITE WORKABLE) just set to absolute numbers.? ?For example, a reasonable set of tidal volume alarms might be:? ?(THIS IS A SUGGESTION NOT A REQUIREMENT)?

Tidal Alarms? LOW? ? ? ? HIGH
? ? ? ? ?1? ? ? ? ? ?100? ? ? ? ? 300
? ? ? ? ? 2? ? ? ? ? ?200? ? ? ? ?400
? ? ? ? ? 3? ? ? ? ? ?300? ? ? ? ?600
? ? ? ? ? 4? ? ? ? ? ?400? ? ? ? ?700
? ? ? ? ? 5? ? ? ? ? ?500? ? ? ? ?800
? ? ? ? ? 6? ? ? ? ? ?600? ? ? ? ?900
? ? ? ? ? 7? ? ? ? ? ?700? ? ? ? ?1000
? ? ? ? ? 8? ? ? ? ? ?800? ? ? ? ?1100
(all values are cc? (equivalent to milliliters)

If you can individually just set low and high tidal volumes, --- that probably even BETTER.? Being able to set high and low to specific values is how most aneshtesthisa equipment that I used in my career normally worked.? ?But this is not "normal" anymore.? ? ?We just need a way to make some setting.....

I don't particularly care at this moment exactly HOW and I don't think the FDA cares either.

But we need it FINISHED
THANKS!!!
Gordon Gibby

My current crappy code enclosed.? NO WARANTEE FOR ANY PURPOSE WHATSOEVER.? ?But it now survives removing an I2C line.


Re: #ExhalationValve #ExhalationValve

 

it occurred to me that shortening the length of rubber tubing would reduce shear stress due to longitudinal expansion and would also increase life

Erich Schulz,?mbbs, mba, fanzca
0410 277 408


On Sat, 11 Apr 2020 at 15:01, <sydneygold888@...> wrote:
AJ , if the damage to the butyl tube is occurring where it pushes over the PVC tube , have you shaved off the sharp corner and radiused the edge of the PVC tube to take away the notch effect? ?

That might double or triple the lifespan.


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

On Fri, Apr 10, 2020 at 09:55 PM, Erich Schulz wrote:
Let me know if have any drawings Tom
I have some small RC servos on order, from a USA shipper. Will likely be hand cutting and layering plexiglas sheets to try something out. I have a tiny CNC router, but have not become proficient with the mechanical CAD tools yet. For now I'm better with hand tools and paper.?

Tom, wb6b


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

On Fri, Apr 10, 2020 at 09:40 PM, Jerry Gaffke wrote:
It will take a lot of refills
True. Scuba tanks may only be viable as a backup when power is out or transport. Fire stations may be able to fill the tanks, especially if some of the firefighters are scuba divers and have a fill adaptor. I wonder what the logistics of that would be. I suppose if the compressed air in the hospital was a weak link in a power outage (along with all the other equipment that must be kept running), then a battery backup on the ventilator would be moot.?

Tom, wb6b


Re: #ExhalationValve #ExhalationValve

 

AJ , if the damage to the butyl tube is occurring where it pushes over the PVC tube , have you shaved off the sharp corner and radiused the edge of the PVC tube to take away the notch effect? ?

That might double or triple the lifespan.


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

Let me know if have any drawings Tom

Erich Schulz,?mbbs, mba, fanzca
0410 277 408


On Sat, 11 Apr 2020 at 14:53, Tom, wb6b <wb6b@...> wrote:
On Fri, Apr 10, 2020 at 08:54 PM, <sydneygold888@...> wrote:
If using a bellows style with DC servo drive motor we could get infinite output curves with the right software.
Good point. From my layman's (but hopefully improving) view that is a good way to go. There is an interesting "museum" of photos of old ventilators. Bellows were ?one of the main designs. Seems like the Bird ventilator was an early departure from that, using a nozzle blowing compressed oxygen into a venturi to suck in air to mix with the compressed O2 gas flow. Timing and control done by air circuits. In many ways that design is more amazing the current designs that can rely on a microprocessor to do the heavy lifting.

In my case I'm leaning towards a design that optionally could use one "low pressure" air source (bellows, turbine, bellows or blower air mattress inflators, industrial strength turbine pumps) to power multiple ventilators. So I'm looking at an easy to build, possibility disposable, valve(s) controlled by an RC servo. Also it seems the two port designs are universal, have many accessories designed to work within that system, and have evolved to handle the real world of sick patients driving messy substances into the system.?

Many creative designs have been proposed to help in they crisis. Even if many don't make it out of the gate immediately, maybe we will see many of these designs developing into innovative, smaller, simpler to use, more cost effective machines that will make it into the mainstream in the future. ?

Tom, wb6b


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

On Fri, Apr 10, 2020 at 08:54 PM, <sydneygold888@...> wrote:
If using a bellows style with DC servo drive motor we could get infinite output curves with the right software.
Good point. From my layman's (but hopefully improving) view that is a good way to go. There is an interesting "museum" of photos of old ventilators. Bellows were ?one of the main designs. Seems like the Bird ventilator was an early departure from that, using a nozzle blowing compressed oxygen into a venturi to suck in air to mix with the compressed O2 gas flow. Timing and control done by air circuits. In many ways that design is more amazing the current designs that can rely on a microprocessor to do the heavy lifting.

In my case I'm leaning towards a design that optionally could use one "low pressure" air source (bellows, turbine, bellows or blower air mattress inflators, industrial strength turbine pumps) to power multiple ventilators. So I'm looking at an easy to build, possibility disposable, valve(s) controlled by an RC servo. Also it seems the two port designs are universal, have many accessories designed to work within that system, and have evolved to handle the real world of sick patients driving messy substances into the system.?

Many creative designs have been proposed to help in they crisis. Even if many don't make it out of the gate immediately, maybe we will see many of these designs developing into innovative, smaller, simpler to use, more cost effective machines that will make it into the mainstream in the future. ?

Tom, wb6b


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

It will take a lot of refills if continuously breathing from scuba tanks for weeks on end.
I'd guess a couple hours per tank for each patient.
Not cheap energy-wise to compress air to 2000 psi for no good reason.
The regulators are interesting, simple and reliable enough, mostly.

Jerry, KE7ER


On Fri, Apr 10, 2020 at 03:32 PM, Tom, wb6b wrote:
On Fri, Apr 10, 2020 at 03:09 PM, Arv Evans wrote:
Scuba Tanks as a regulated air source
Hmmm... I've got two of those sitting in my garage, as well as first stage regulators. Maybe many other folks do, also. Probably need to live near the coastlines to find places to fill them to the required 3000 (and more) PSI of filtered air.

Tom, wb6b


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

ARDS ventilators should really be capable of delivering tidal volumes against 30cmH2O (and arguably 40 for brief periods, such as "recruiting").

It's my impression that power won't be and issue with this (UF) design, but will be with other designs (especially turbine designs).

I'm feeling in my bones (having looked at numerous projects now) that control and regulation and sensing are likely to be greater pain points overall.

Erich Schulz,?mbbs, mba, fanzca
0410 277 408


On Sat, 11 Apr 2020 at 13:54, <sydneygold888@...> wrote:
Tom , the Medtronics uses a Blower from AirFan ( France ) , they put out 86 millibar ( 87 cm / H2o ) aka 34 in/H2o at 100 Litres / minute.

Ventilators need only 4 - 20 cm H2o? but the AirFans and other brands of high pressure pumps are expensive? and as i mentioned above , their lead time is over 10 months.

If using a bellows style with DC servo drive motor we could get infinite output curves with the right software.


Re: Anyone working on solutions that work on 12VDC and facilities without compressed air?

 

Tom , the Medtronics uses a Blower from AirFan ( France ) , they put out 86 millibar ( 87 cm / H2o ) aka 34 in/H2o at 100 Litres / minute.

Ventilators need only 4 - 20 cm H2o? but the AirFans and other brands of high pressure pumps are expensive? and as i mentioned above , their lead time is over 10 months.

If using a bellows style with DC servo drive motor we could get infinite output curves with the right software.


Re: Volume Assembly

 

¿ªÔÆÌåÓý

We are in the homestretch here folks, we need a few things added to the software, then we have to test it and see what we screwed up, get the stuff that the FDA wants, and get this done with. ?

I took 29 pages of their many questions and put out a Pleliminary draft after three hours. ? It really wasn¡¯t that hard. ?They are bending over backwards to try to help these things get done.?


Let¡¯s get this project finished!

Gordon



On Apr 10, 2020, at 21:30, Gordon Gibby via groups.io <docvacuumtubes@...> wrote:

?Mr. Dishup is providing very important information: ?The perception of a person who might possibly have been able to help. ? But the regulatory system and the lawyers strangle us all. ?If you¡¯ve never been sued, you don¡¯t really understand in my opinion. ?Whatever. ?we have done may benefit people in other parts of the world or it may not. ? I¡¯m not in charge of that. ?I¡¯m in charge of what I can do with my time left on this earth and I chose to donate it to try to make this have some chance of succeeding. I have done that. ?

Anybody else think they can do it better, step up to the plate! ? A good number of people here have provided real effort, designs, schematics working systems, working code, answers to urgent questions, test results. ? ? Providing scathing opinions without helpful improvements that you yourself have built & tested is merely attempting to add extra work to people who are already overworked and looks sort of like.....well....inappropriate. ??

Now, the code is there, and it needs improvement, so if any of you are ready to add user adjustable ?alarms, go for it! ?That¡¯s what we need next

The hardware is now pretty fixed, the ventilatory hardware is very close to being fixed (a choice of three expiratory valve options, all of which are satisfactory) ¡ª And I would like to have this code finished by the end of Sunday so that the necessary testing can be done which the FDA now only looks for 24 hours and we could get this finished.

Let¡¯s not make a career out of this, that won¡¯t help anybody except egos. ?There are people out there who might be salvageable. ?


On Apr 10, 2020, at 21:09, n8wff via groups.io <n8wff@...> wrote:

?I vehemently disagree.? Liability is a huge concern.? Maybe not for you if you have not contributed directly.? Consider that I own Ten Tec.? I have four MYDATA pick and place machines and a 12,000 square foot industrial building that is essentially my retirement.? Why is medical cost so high in the US?? One factor is liability insurance from malpractice.? There are no poor doctors or hospital employees in the US.? There are a predatory class of attorneys that sue for any reason IF their intended target has any assets they can get.? How often do you see a poor person being sued?? A doctor living in a mansion is a target because he has money. It doesn't matter if he committed malpractice or not. What matters is if the attorney can wring a settlement out of his insurance company.? If he isn't insured enough he will loose his mansion.? That predatory?attorney and the law doesn't care about right or wrong -? he is there to extort some sort of payment for his client. The more he can get, the higher his percentage.? If you want to fix the health care crisis in the US then outlaw malpractice. Lets face it -? if you go to a doctor and let him cut on you, you probably are going to die without his intervention. So when you come in the door of the ER you are a dead man walking. A corpse waiting to happen.? You might not make it, and it has nothing to do with malpractice.? Are there bad and incompetent doctors?? You bet. Every once in a while one slips through the cracks.? But how many people are denied health care because of the high cost of health care mandated by malpractice and all the insurance paperwork?? I'm one of them! Ask ANY small business owner about it. I would NEVER open my own business again given the current state of health care and insurance in the US. The American dream is dead. Work on a better system of checks and balances than malpractice insurance!? Notice the problem is the insurance company -? they make money on both sides of the system -? from the patient and from the doctor.? Get rid of the insurance companies is the solution.? Get rid of malpractice.? If a doctor looses too many cases then have him face a review board by the hospital and the licensing state and if he gets too many strikes YANK HIS LICENSE FOR GOOD.? Just like a DWI.? How much money is made by insurance companies year after year?? How much of the national debt was increased to bail them out when they screwed the pooch?? Too big to fail?? Are you serious?? Here is a thought Quit spending money on health insurance and malpractice insurance and put that money to work on something that is needed -? HEALTH CARE. Lets hire and train more doctors and nurses and build new hospitals so EVERYONE can have health care.? When are we going to get current with the rest of modern first world countries and recognize that HEALTH CARE should be a basic human right?? Why is your life worth more than mine just because of financial circumstances?? We say all life is precious. We talk the talk but we don't do the walk. We don't even crawl. We brag that small business is the engine of opportunity and growth yet it is small business that slips through the cracks of the system and nobody anywhere does anything about it or even cares. You know why you don't care?? Because if you did you would do something to fix the problem!

But to my original point -? I'd love to help and I'm in a position to help. I could build my control next week and if I had money I could build thousands of them.? But how can I put everything I have worked for my entire life at risk?? I was not included in the developers covered by the UF liability insurance for whatever reason.? I have a control ready to make the PC Board for that has safety interlocks and a number of other features for patient safety that are missing on the present UF unit.? But I'm not a rich doctor. I am working class poor. Because I own a company that has bills and employees that have to be paid and they get paid before I do.? If there is anything left for me, I don't dare spend it because I might run short next month.? I can build packaged ventilators for 500 dollars of parts each, yet I will have to sell it for 5000 each to deal with the liability issues.? I'm highly frustrated because I have the desire to help, engineering experience from high volume (millions) of appliance controls under my belt, and the manufacturing facility and equipment to fast track this to production.? I can do things faster and less expensive than GM, yet no one has responded to my emails at wither the White House or the Ohio Governor's office. Then there is the matter of the FDA blessing and having to file for this myself.? How can I or anyone else do this to help or to do it on a not for profit basis?? It ends up being more work than producing our regular business of manufacturing radios and circuit boards.?So basically I've wasted 300 hours of productive time that could have been used to take care of my own problems like the laid off employees due to the government suspension of my business. I get NO INCOME whatsoever if I don't work and charge customers and my business is forcibly shut down. ?I started out trying to help as you suggest and ended up getting burned. This will be my last involvement with open source anything ever. Anybody in a position to help me help others?? Quit flapping your gums and step up. I'm driving a 25 year old car and can't afford health insurance.? I tried to help.? Show me how I can do it and not loose what little I have.? But don't you dare tell me liability isn't a concern.

So, what is going to happen since no one can afford to take this liability on, this will fester and people needing ventilators are going to die. That is the price that we pay for letting insurance companies, attorneys, administrators and governing bodies like the FDA to regulate and take all power away from a physician to actually do what a physician needs to do -? treat a patient.? The money we spend on the salaries of all the dead weight employees of the insurance companies and profits to the share holders of those companies is more than what we actually spend on treating patients. You can NOT? allow health insurance companies to operate at a for profit model because the soie responsibility for any CEO is to maximize profit for the share holders and unfortunately that means cut the cost spent on healthcare that directly effects the quality of care the patient receives. How many times have you heard of insurance denying proceedures and care to patients?? Isn't that up to the doctor and not some nurse hired by the insurance company to oversee who gets what care?? The system is broken. Shut it down and reboot!

If you can help and have a solution put your money where you mouth is. I'll finish my design work and build it if you take the liability.

I doubt this effort will amount to anything at this point. There are too many uncertainties to deal with including the safety if the software libraries used. I learned there is a group using multiple 3D printers to reproduce a 1965 US Army designed analog controlled ventilator that take 12 dollars of parts to manufacture so this probably is not the way to go.

The control board for this effort is not trivial enough that you would hand assemble it.? I doubt 3rd world people could get the funding necessary to go somewhere and have them built. I suppose ou can have them made in China, the lawless country which made this problem in the first place, because if they build it then the attorneys will realize that they cant\'t get money out of the Chinese so there will be no law suits.?Isn't it funny that the country who let this virus off the chain will actually profit from sales of materials necessary to make the ventilators? this isn't an accident -? it is negligence or an act of war and the entire world is paying the price.? But that isn't the issue.? The issue is how do we mitigate and control the damage at this point?? We have something that probably will work and save SOME patients.? If it is a choice of certain death because of no ventilator as opposed to a chance to live on whatever contraption is available, which would every one of us choose? Certain death or a chance a tife.? What is the right answer?? Do we have to even ask this question?? How many trakes have been legendarily implemented with a ball point pen?? Is that pen FDA approved?? It is up to the ATTENDING PHYSICIAN to determine the level of treatment with whatever is available, and since the dawn of medicine the standard has been to DO NO HARM.? So if that standard is applied, in this case the choice between certain death and ventilation, why do we even have to worry about liability?? That is the issue. Save a life and loose everything you worked all our life for, and end up homeless under the underpass living in a cardboard box. Maybe you can make that choice for yourself but what about for your entire family?

You can help and make it happen?? My phone is 614 675 2497 and it rings right to my desk.? Which one of you is going to step up and take the liability that isn't important?
Mike N8WFF.