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All Patents in class 72/432
Patents 1 - 5 of 5
First set of recordsLast set of records
5,765Sep. 12, 1848F.E. SickelsMethod of Controlling Motive Powerpower hammers
39,924Sep. 15, 1863B. HotchkissImproved Atmosheric Trip-Hammersteam hammers
RE2,389Nov. 06, 1866B. HotchkissTrip Hammertrip and helve hammers
264,859Sep. 26, 1882J.C. ButterfieldAtmospheric hammerdrop hammers
2,942,503Jun. 28, 1960R.P. FitzgeraldPower operated hammersdrop hammers
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