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| All Patents in class 251/232 | |||||
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| Number | Date | Patentee | Title | Type | |
| 313,961 | Mar. 17, 1885 | J.B. Stanwood | Valve-rod connection | steam engines | |
| 2,276,227 | Mar. 10, 1942 | E.J. Dillman | Control Device | temperature controls | |