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All Patents in class 267/137
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	144,058	Oct. 28, 1873	J.C. Butterfield	Improvement in power-hammers
	358,672	Mar. 01, 1887	W.R. Jenkins, Jr.	Power Hammer
	1,725,212	Aug. 20, 1929	F. Schneider	Power hammer

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