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| Patents for William R. Gerhart | |||||
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| Number | Date | Patentee | Title | Type | |
| 250,124 | Nov. 29, 1881 | J. Bender | Blowing Machine | blacksmith | |
| 858,267 | Jun. 25, 1907 | A.M. Dellinger | Grinding-mill | grinding mills | |