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| All Patents in class 106/687 | |||||
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| Number | Date | Patentee | Title | Type | |
| 100,944 | Mar. 15, 1870 | S. Sorrel | Material for making grinding wheels | ||
| 126,041 | Apr. 23, 1872 | J.S. Elliott, J.F. Wood | Method of making stone for grinding wood-pulp | ||