All Patents in class 252/502


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All Patents in class 252/502
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	269,132	Dec. 12, 1882	W. Stanley, Jr.	Carbon filament produced from hair
	323,372	Jul. 28, 1885	W. Stanley, Jr., E.P. Thopmson	Carbon for incandescent lamps