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| Patents for H. B. Hamilton | |||||
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| Number | Date | Patentee | Title | Type | |
| 260,527 | Jul. 04, 1882 | H. Bolthoff | Cam-shaft box for stamp-mills | ore processing apparatus | |
| 261,297 | Jul. 18, 1882 | H. Bolthoff | Mortar for stamp-mills | ore processing apparatus | |