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| Patents for Charles Douglass | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 68,012 | Aug. 20, 1867 | J. Swan | Manufacture of Single Twist Augers | |
 | 80,027 | Jul. 14, 1868 | J. Swan | Improvement in the Manufacture of Auger-Bits | |