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| Patents for Hobert C. Hart | |||||
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| Number | Date | Patentee | Title | Type | |
| 161,031 | Mar. 23, 1875 | H.C. Hart | Bit-stock with rotating chuck | brace chucks | |
| 207,964 | Sep. 10, 1878 | H.C. Hart | Ratchet bit-stock | brace chucks | |