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| All Patents in class 60/531 | |||||
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| Number | Date | Patentee | Title | Type | |
| 92X | Jan. 16, 1795 | J. Perkins | Machine for cutting nails | nail making machines | |
| 419,805 | Jan. 21, 1890 | C.W. Weiss | Thermo Dynamic Motor | external combustion engines | |
| 451,824 | May 05, 1891 | L. Kessler | Hydropneumatic Engine | steam motors | |
| 2,266,975 | Dec. 23, 1941 | W.S. Landon | Control Device | flow controls | |
| 2,433,493 | Dec. 30, 1947 | J.L. Turner | Electrically Heated Bellows Motor | valves | |