All Patents in class 336/67


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All Patents in class 336/67
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	422,746	Mar. 04, 1890	M. von Dolivo-Dobrowolsky	Electric induction apparatus or transformer
	663,454	Dec. 11, 1900	F.W. Martin, F. Stewart	Electric-arc lamp
	2,428,234	Sep. 30, 1947	A.G. Mapp	Internal Micrometer