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All Patents in class 91/424
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,531,490	Mar. 31, 1925	W.I. Seymour, G.P. Macready	Pneumatic drop hammer
	1,924,545	Aug. 29, 1933	W.H. Fitzgerald, R.P. Fitzgerald	Drop hammer

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