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| All Patents in class 91/277 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 227,460 | May 11, 1880 | J. Watt | Steam-Hammers | ||
| 541,785 | Jun. 25, 1895 | J.F. Doolittle | Steam Hammer | ||
| 1,062,808 | May 27, 1913 | H. Tscherning | Apparatus for jarring and pressing granular materials | ||
| 2,178,850 | Nov. 07, 1939 | A.H. Dall | Spindle Oscillator | ||
 | 2,656,681 | Oct. 27, 1953 | G.J. Peterson | Variable stroke power actuator | |