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| All Patents in class 428/119 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,091,523 | Mar. 31, 1914 | G.H. Merrill | Lifting Board for Drop Hammers | drop hammers | |
| 1,440,608 | Jan. 02, 1923 | H.E. Kleist, C.J. Kleist | Drop Hammer Board | drop hammers | |