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| Patents for Charles M. Knowles | |||||
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| Number | Date | Patentee | Title | Type | |
| 205,400 | Jun. 25, 1878 | C.M. Knowles | Bit-stock | brace chucks | |
| 210,335 | Nov. 26, 1878 | C.M. Knowles | Bit-stock | brace chucks | |