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| Patents for Douglass Mfg. Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 27,946 | Apr. 17, 1860 | J. Blake | Auger | adjustable drill bits | |
| 76,956 | Apr. 21, 1868 | J. Swan | Improvement in auger-handles | hand drills | |
| 106,919 | Aug. 30, 1870 | A.F. Cushman | Improvement in Hollow Augers | hollow bits | |