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| Patents for John R. Gammeter | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,245,213 | Nov. 06, 1917 | J.R. Gammeter | Tire-Calipers | calipers | |
| 1,521,238 | Dec. 30, 1924 | J.R. Gammeter | Grooving Machine | tire facing and grooving tools | |