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| All Patents in class 72/263 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,620,534 | Mar. 08, 1927 | C.R. Gabriel | Press | punch presses | |
| 2,742,802 | Apr. 24, 1956 | H.A. Weyer, E.C. Clarke | Impact device | drop hammers | |