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NOS SWEDISH GAGE CO. PATENT DIAL BORE GAGE A9307 IOB - USA PATENT

Regular price $95.00 USD

Patented in the US by Carl Edvard Johansson around 1930. 13/16" - 1 3/8" gage mint in box. Looks to have been barely if ever used.  Patent no. 1740695 & 18810710.

Gauge patent via datamp.org

Surface plate patent via datamp.org