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All Patents in class 173/212 | |||||
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 |