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| All Patents in class 92/7 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 292,525 | Jan. 29, 1884 | C.C. Worthington | Duplex pumping-engine | ||
| 731,872 | Jun. 23, 1903 | F.G. Echols | Motor Mechanism | ||
| 1,847,073 | Mar. 01, 1932 | W. Ernst | Hydraulic Press | ||