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| All Patents in class 137/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 318,597 | May 26, 1885 | H. Burton | Cut-off valve | steam engines | |
| 1,190,945 | Jul. 11, 1916 | J.L. Osborne | Pump Controlling Device | pumps | |
| 1,496,005 | Jun. 03, 1924 | H.B. Lee | Apparatus for controlling boiler water feed | feedwater apparatus | |
| 2,669,982 | Feb. 23, 1954 | C.H. Schowalter | Ambient Air Control of Blower By-Passes | fuel systems | |
| 2,915,076 | Dec. 01, 1959 | K.A. Teumer | Temperature compensating device | ||