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| All Patents in class 72/256 | |||||
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| Number | Date | Patentee | Title | Type | |
| 922,585 | May 25, 1909 | L.E. Hooker | Method of manufacturing cartridge-shells | cartridges | |
| 1,468,092 | Sep. 18, 1923 | W.M. Towne | Method and apparatus for forming tubular metal articles, socketed terminal lugs, and the like | tube making machines | |
| 2,344,803 | Mar. 21, 1944 | W.W. Criley | Method of Forging Shovel Sockets and the Like | forging dies | |
| 2,415,696 | Feb. 11, 1947 | W. Klocke | Extrusion apparatus | extruding machines and dies | |