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| All Patents in class 51/299 | |||||
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| Number | Date | Patentee | Title | Type | |
| 25,747 | Oct. 11, 1859 | T.J. Mayall | Improvement in methods of combining emery with caoutchouc | grinding wheels | |
| 1,261,669 | Apr. 02, 1918 | W.E. Wright | Sawing Apparatus | ||
| 2,221,173 | Nov. 12, 1940 | R.S. Gutsell | Sanding or polishing wheel | grinding wheels | |