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| All Patents in class 74/521 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 170,868 | Dec. 07, 1875 | C. Lusted | Drop-Hammer | ||
| 428,416 | May 20, 1890 | J.M. Riley | Shaping Machine | ||
| 3,103,701 | Sep. 17, 1963 | A.E. Calchera, F.J. Bucci | Mold press | ||