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All Patents in class 173/212
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
176,400Apr. 18, 1876J.C. ButterfieldImprovement in atmospheric hammersdrop hammers
472,495Apr. 05, 1892D. DrawbaughPneumatic tool
518,032Apr. 10, 1894W.E. GibbsPercussion Tool
530,934Dec. 18, 1894D. DrawbaughPneumatic tool
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