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All Patents in class 74/828
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	71,823	Dec. 03, 1867	B. Walker	Forge Hammer
	230,612	Aug. 03, 1880	C.M. Brown	Power-hammer
	1,017,916	Feb. 20, 1912	G.H. Rowe	Power Hammer
	1,154,667	Sep. 28, 1915	H.C. Smith	Power-Hammer

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