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| All Patents in class 451/551 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 442,801 | Dec. 16, 1890 | G.B. Eckhardt | Stone Grinding Wheel | ||
 | 1,105,088 | Jul. 28, 1914 | D.F. McGovern | Polishing-wheel | |
| 1,105,089 | Jul. 28, 1914 | D.F. McGovern | Polishing-wheel | ||
 | 1,195,555 | Aug. 22, 1916 | J.A. Campbell | Floor dressing and polishing machine | |
| 1,354,325 | Sep. 28, 1920 | J.R. Mitchell | Stone-polishing wheel | ||
 | 1,938,548 | Dec. 05, 1933 | H.E. Tautz | Machine table extension | |