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