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| All Patents in class 292/256.71 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,711,312 | Apr. 30, 1929 | A.F. Froussard | Pump | pumps | |
| 2,374,478 | Apr. 24, 1945 | B.E. Folke | Closure for Lubricators | steam engine lubricators | |