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| Patents for Ernest O. Estwing | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,578,502 | Mar. 30, 1926 | E.O. Estwing | Hatchet | axes | |
| RE16,820 | Dec. 20, 1927 | E.O. Estwing | Hatchet | axes | |
| 1,707,787 | Apr. 02, 1929 | E.O. Estwing | Estwing Hammer & Hatchet Handle | hammer handles | |