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| Patents for James C. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 354,359 | Dec. 14, 1886 | J.C. Spencer | Handle for screw-drivers and other tools | spiral screwdrivers | |
| 380,360 | Apr. 03, 1888 | J.G. Smith, J.C. Spencer | Combined Rule, Square, Bevel, Calipers, &c. | marking gauges | |