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All Patents in class 200/46
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	2,292,387	Aug. 11, 1942	H.K. Markey, G. Antheil	Secret communication system
	2,511,956	Jun. 20, 1950	T.A. Wetzel	Tracer Controlled Machine Tool
	2,947,928	Aug. 02, 1960	C.H. Killian	Automatic Machinist
	3,044,508	Jul. 17, 1962	C.A. Sherman	Mark sensing lumber defect cutter

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