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| Patents for Charles Douglas | |||||
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| Number | Date | Patentee | Title | Type | |
| 78,769 | Jun. 09, 1868 | J. Swan | Machine for Upsetting Cook's Bits | making drills and augers | |
| 469,852 | Mar. 01, 1892 | C. Douglas | Shaper for shoe-brushes, brush-backs, etc. | specialty woodworking machines | |