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| All Patents in class 451/543 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 779,848 | Jan. 10, 1905 | G. Hart | Grinding-wheel | |
 | 825,460 | Jul. 10, 1906 | G. Hart | Grinding-wheel | |
 | 945,526 | Jan. 04, 1910 | G. Hart | Grinding-wheel | |
 | 1,470,740 | Oct. 16, 1923 | T.S. Hose | Polishing Wheel | |
| 1,582,608 | Apr. 27, 1926 | E.R. Hyde | Sectional Grinding Wheel | ||
 | 1,949,513 | Mar. 06, 1934 | W.W. Greenwood | Grinding wheel | |