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| All Patents in class 451/546 | |||||
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| Number | Date | Patentee | Title | Type | |
| 163,880 | Jun. 01, 1875 | S.G. Morrison | Improvement in modes of applying emery to metal surfaces | grinding wheels | |
| 172,337 | Jan. 18, 1876 | S.G. Morrison | Improvement in emery grinding-wheels | grinding wheels | |
| 226,066 | Mar. 30, 1880 | G. Hart | Emery-wheel | grinding wheels | |
| 642,828 | Feb. 06, 1900 | J.F. Spohn | Grinding or Polishing Wheel | grinder wheels | |
| 699,302 | May 06, 1902 | W.D. Howe, G.H. Fowler | Grinding-wheel | grinding wheels | |