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Old 17th Nov 2018, 10:34 am   #38
rontech
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Join Date: Jun 2017
Location: Southport, Merseyside, UK.
Posts: 646
Default Re: Why both 33 and 45 ?

I read somewhere that Neuman, the manufacturer of cutting lathes, developed the first versions of the technique. This was in the early 1950's.
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