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| All Patents in class 72/4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,742,802 | Apr. 24, 1956 | H.A. Weyer, E.C. Clarke | Impact device | drop hammers | |
| 3,150,391 | Sep. 29, 1964 | A.R. Kull | Safety Device for Forging Machines | forging apparatus and accessories | |
| 3,283,551 | Nov. 08, 1966 | R.H. Armbruster, D.H. Kraft | Automatic feed mechanism for a press | metalworking presses | |