All Patents in class 315/283


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All Patents in class 315/283
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	664,995	Jan. 01, 1901	G. Ernst	Screw Thread Gage
	2,424,505	Jul. 22, 1947	B.P. Rupersburg	Method of and apparatus for operating hot cathode lamps