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| Patents for Franklin L. Hamlen | |||||
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| Number | Date | Patentee | Title | Type | |
| 307,187 | Oct. 28, 1884 | Z.T. Furbish, F.L. Hamlen | Ratchet Screw-Driver | ratcheting screwdrivers | |
| 315,137 | Apr. 07, 1885 | F.L. Hamlen, Z.T. Furbish | Ratchet Screw-Driver | ratcheting screwdrivers | |