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| Patents for Samuel H. Keefer, estate of (deceased) | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,156,484 | Oct. 12, 1915 | S.H. Keefer, estate of (deceased) | System of Motor Control | machine tool controls | |
| RE14,540 | Oct. 22, 1918 | S.H. Keefer, estate of (deceased) | Planer and System of Motor Control Therefor | machine tool controls | |