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| All Patents in class 251/57 | |||||
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| Number | Date | Patentee | Title | Type | |
| 192,273 | Jun. 19, 1877 | N.E. Nash | Steam-Engine Governor | steam engine governors | |
| 2,224,377 | Dec. 10, 1940 | G.H. Clark | Refrigerating Apparatus | refrigeration apparatus | |
| 2,335,824 | Nov. 30, 1943 | E.J. Dillman | Valve | valves | |
| 2,493,297 | Jan. 03, 1950 | W.S. Landon | Orifice Cleaning Means | pipe and orifice cleaners | |