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| All Patents in class 173/124 | |||||
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| Number | Date | Patentee | Title | Type | |
| 370,952 | Oct. 04, 1887 | F.M. Leavitt | Drop-hammer | drop hammers | |
| 665,249 | Jan. 01, 1901 | L. Mayer | Trip-hammer ram connection | drop hammers | |