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| All Patents in class 91/303 | |||||
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| Number | Date | Patentee | Title | Type | |
| 492,870 | Mar. 07, 1893 | A.B. Landis | Pumping-engine | pumps | |
| 626,497 | Jun. 06, 1899 | E.C. Meissner | Pneumatic Hammer | handheld power hammers | |