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| Patents for Herman J. Bierhart | |||||
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| Number | Date | Patentee | Title | Type | |
| 312,826 | Feb. 24, 1885 | M. Deering | Power-hammer | trip and helve hammers | |
| 385,540 | Jul. 03, 1888 | H.J. Bierhart | Power Hammer | drop hammers | |