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| All Patents in class 294/31.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 213,698 | Mar. 25, 1879 | G.D. Dudley, D. Sherwood | Fruit-Jar Wrench | jar wrenches | |
| 492,714 | Feb. 28, 1893 | J.H. Dean | Fruit Can Wrench | jar wrenches | |
| 4,532,833 | Aug. 06, 1985 | E.S. Downs | Strap-type wrench for removing rotatable closures or similar members | jar wrenches | |