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| All Patents in class 451/517 | |||||
| Picture | Number | Date | Patentee | Title | |
| 2,242,545 | May 20, 1941 | C.H. Randolph | Rubbing machine | ||
| 2,464,296 | Mar. 15, 1949 | G.H. Ekstrom | Pad attaching means for rubbing machines and the like | ||
| 2,505,683 | Apr. 25, 1950 | C.D. Mccarthy | Abrasive shoe for rubbing machines | ||