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| All Patents in class 91/244 | |||||
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| Number | Date | Patentee | Title | Type | |
| 417,653 | Dec. 17, 1889 | J.B. Stanwood | Steam-engine | steam engine valve gear | |
| 1,965,261 | Jul. 03, 1934 | C.L. Schulte | Grinding Machine | grinding machines | |
| 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices | drop hammers | |