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| Patents for Joseph T. Clarkson | |||||
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| Number | Date | Patentee | Title | Type | |
| 189,635 | Apr. 17, 1877 | J.R. Locke | Improvement in oscillating cutter-heads for finishing spokes | wheelwright | |
| 229,008 | Jun. 22, 1880 | C.F. Pettingell | Hand-screw | hand screws | |