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| Patents for Percy P. Hinckley | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,350,803 | Aug. 24, 1920 | P.P. Hinckley | Combined Valve-Lifter and Hand-Vise | valve spring tools | |
| 1,350,804 | Aug. 24, 1920 | P.P. Hinckley | Valve Grinder | valve grinding tools | |