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| Patents for Herman M. Vance | |||||
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| Number | Date | Patentee | Title | Type | |
| 616,658 | Dec. 27, 1898 | P.W. Gates, A.J. Gates | Rock or Ore Breaker | ore processing apparatus | |
| 616,659 | Dec. 27, 1898 | P.W. Gates, T.W. Capen | Rock or Ore Breaker | ore processing apparatus | |