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| Patents for Charles Robson | |||||
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| Number | Date | Patentee | Title | Type | |
| 42,489 | Apr. 26, 1864 | J.C. Johnson | Improvement in Gas-Tongs | pipe wrenches | |
| 249,259 | Nov. 08, 1881 | H.B. Riehlé | Wedge-clamp | ||