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| All Patents in class 403/186 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,956,885 | May 01, 1934 | F.J. Vlchek | Drop Hammer | drop hammers | |
| 2,627,313 | Feb. 03, 1953 | N.M. Marsilius | Safety device for die-sets | tool and die maker | |