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| Patents for H. C. Hartman | |||||
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| Number | Date | Patentee | Title | Type | |
| 395,572 | Jan. 01, 1889 | F.A. Lomont | Pulley | industrial machine pulleys and belt drive mechanisms | |
| 538,745 | May 07, 1895 | V.C. Rocholl | Pipe Wrench | pipe wrenches | |