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| All Patents in class 173/201 | |||||
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| Number | Date | Patentee | Title | Type | |
| 49,593 | Aug. 22, 1865 | H. Shattuck | Improved Atmospheric Hammer | power hammers | |
| 559,251 | Apr. 28, 1896 | J. Bêché | Pneumatic Hammer | power hammers | |
| 1,017,916 | Feb. 20, 1912 | G.H. Rowe | Power Hammer | power hammers | |
| 1,145,983 | Jul. 13, 1915 | J.B. French | Cushioning Piston for Power Hammers or the Like | ||
| 3,269,466 | Aug. 30, 1966 | W.G. Mitchell | Impact tool | impact chisels and drills | |
| 3,650,336 | Mar. 21, 1972 | H.P. Koehler | Power driven device | impact chisels and drills | |