View single post by Randy Rohr
 Posted: Tue Mar 12th, 2013 02:33 pm
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Randy Rohr



Joined: Sun Jun 8th, 2008
Location: Palmyra, Virginia USA
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 Steve Cunningham wrote: I looked and found no specific history on drive screws. They were made by a process called thread rolling. I don't think that came out till later.

That's really a process similar to knurling, so in theory it could have existed at that  time.

RR