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| All Patents in class 209/56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 261,297 | Jul. 18, 1882 | H. Bolthoff | Mortar for stamp-mills | ore processing apparatus | |
| 515,896 | Mar. 06, 1894 | H. Bolthoff | Mortar for stamp-mills | ore processing apparatus | |