Here are a couple of entries from the group 'Files' :
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This was a suggested design from a group member - don't know if it was ever constructed - based on the threading idea of Doug Collinge.
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And Collinge's original article on threading with the UNIMAT DB/SL -
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/g/Unimat/files/Simple%20thread%20cutting%20on%20a%20Unimat/Simple%20thread%20cutting%20on%20a%20Unimat.pdf
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