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| Patents for Douglas M. Campbell | |||||
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| Number | Date | Patentee | Title | Type | |
| 609,872 | Aug. 30, 1898 | D.M. Campbell | Bale Tie | ratchet wrenches | |
| 630,825 | Aug. 08, 1899 | D.M. Campbell | Winding Tool For Bale Fastenings | ratchet wrenches | |
| 666,492 | Jan. 22, 1901 | D.M. Campbell | Turning Tool for Bale Band Fasteners | band opening and closing tools | |
| 671,180 | Apr. 02, 1901 | D.M. Campbell | Turning Tool for Bale Band Fasteners | band opening and closing tools | |