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| Patents for James C. Williamson | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,506,704 | Aug. 26, 1924 | J.C. Williamson | Caliper | calipers | |
| 1,547,480 | Jul. 28, 1925 | J.C. Williamson | Calipers | indicating calipers | |