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All Patents in class 356/393
Patents 1 - 3 of 3
First set of recordsLast set of records
1,480,390Jan. 08, 1924J. HartnessApparatus for Inspecting and Gauging Screw Threads
1,732,730Oct. 22, 1929R.W. PorterMethod and Apparatus for Measuring and Comparing Gears and the Likegear measuring machines
1,745,523Feb. 04, 1930R.O. BeardsleyApparatus for Testing Taper Threaded Screws
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