All Patents in class 173/212


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All Patents in class 173/212
Patents 1 - 4 of 4
Number	Date	Patentee	Title	Type
176,400	Apr. 18, 1876	J.C. Butterfield	Improvement in atmospheric hammers	drop hammers
472,495	Apr. 05, 1892	D. Drawbaugh	Pneumatic tool
518,032	Apr. 10, 1894	W.E. Gibbs	Percussion Tool
530,934	Dec. 18, 1894	D. Drawbaugh	Pneumatic tool