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| Patents for Frank Shafer | |||||
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| Number | Date | Patentee | Title | Type | |
| 684,931 | Oct. 22, 1901 | D.B. Hanson | Sawmill set-works | sawmill set works | |
| 758,283 | Apr. 26, 1904 | F. Shafer | Calipers | measurement gauges | |