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I'm sure many of you have seen one of these before, but I was looking through some things this weekend and stumbled upon the patent record for this from the early 1900's.  I find it amazing the design of this, and the fact that someone is not making these now.

Anyhow, here is a link to the PDF for the Patent application with a really nice drawing and two pages of write-up on it's design and how it is used.  Possibly I am the only one who finds this interesting, but possibly others will too.

Gaston Pallet and Roller Jewel Setter Patent

 

BTW, if you go to this LINK you can see over 100 other tools in the same category (G043D/045).

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