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| All Patents in class 254/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 111,748 | Feb. 14, 1871 | J. Humphrey | Improvement in pumps | ||
| 333,577 | Jan. 05, 1886 | E.M. Watson | Pipe Lifting Machine | industrial elevators and lifts | |