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| All Patents in class 72/439 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,929,021 | Oct. 03, 1933 | M.H. Flynn | Multiple Roll Set Board Drop Hammer | drop hammers | |
| 1,954,155 | Apr. 10, 1934 | F.J. Vlchek | Drop Hammer | drop hammers | |
| 1,954,156 | Apr. 10, 1934 | F.J. Vlchek | Drop Hammer | drop hammers | |
| 1,954,157 | Apr. 10, 1934 | F.J. Vlchek | Drop Hammer | drop hammers | |
| 1,954,159 | Apr. 10, 1934 | J.C. Wattleworth | Drop Hammer | drop hammers | |