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| All Patents in class 222/318 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,607,855 | Nov. 23, 1926 | F.D. Winkley | Lubricating apparatus | industrial machine lubrication | |
| 2,299,492 | Oct. 20, 1942 | E.M. Pfauser | Pump Assembly | hydraulic pumps | |