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| All Patents in class 91/229 | |||||
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| Number | Date | Patentee | Title | Type | |
| 338,408 | Mar. 23, 1886 | G. Haydn | Motor | ||
| 607,630 | Jul. 19, 1898 | O.A. Ringbom | Steam Engine | steam engine valves | |
| 2,602,437 | Jul. 08, 1952 | W.L. Tancred | Hydraulic Profiler for Truing Devices and the Like | hydraulic apparatus | |
| 2,642,848 | Jun. 23, 1953 | R.G. Knudsen, G.M. Walraven | Air Valve Mechanism for Controling the Operation of Pneumatic Devices and the Like | ||