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| Patents for Greenlee Brothers & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,971,290 | Aug. 21, 1934 | E.C. Swanson, J.H. Abramson | Ratchet mechanism | spiral screwdrivers | |
| 1,971,291 | Aug. 21, 1934 | E.C. Swanson, J.H. Abramson | Ratchet device | spiral screwdrivers | |
| 2,664,126 | Dec. 29, 1953 | E.C. Swanson, J.H. Mansfield | Ratchet spiral screw driver | spiral screwdrivers | |