Richard,? loctal /? loktal? ..s were spoken about ?in this? 1938-12 article:

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pdf??? 20?? -----

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but ?March 1939 revealed some data

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pdf?? 59??? -----

From some reading it seems that RCA? and philco? were in a battle so philco started a deal with Sylvania ??much earlier maybe ??

Probably, the RF tubes for TV is what drove the loktal design ahead of octals due to lower ?capacitance ?

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