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| All Patents in class 173/212 | |||||
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| 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 | ||
| 513,941 | Jan. 30, 1894 | C.B. King | Pneumatic tool | pneumatic tools | |
| 518,032 | Apr. 10, 1894 | W.E. Gibbs | Percussion Tool | ||
| 530,934 | Dec. 18, 1894 | D. Drawbaugh | Pneumatic tool | ||