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| All Patents in class 91/190 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,432,636 | Oct. 17, 1922 | F.E. Stevenson | Duplex Pumping Engine | pumps | |
| 2,782,651 | Feb. 26, 1957 | N.V. Gusching, B. Sassen | Hydraulic Jogger | hydraulic apparatus | |