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| All Patents in class 451/484 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 38,153 | Apr. 14, 1863 | G. Cowing | Polishing Metal Cylinders | ||
| 1,083,452 | Jan. 06, 1914 | N.C. Markham | Grinder and Polisher for Car Journals | ||
 | 1,522,720 | Jan. 13, 1925 | H.C. Heon | Cylinder-grinding tool | |
 | 1,774,711 | Sep. 02, 1930 | H.C. Heon | Cylinder-grinding tool | |