All Patents in class 356/394


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All Patents in class 356/394
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,377,069	May 03, 1921	J. Hartness	Mechanism for Gaging Screw Threads
	1,745,523	Feb. 04, 1930	R.O. Beardsley	Apparatus for Testing Taper Threaded Screws