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| All Patents in class 451/309 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,594,445 | Aug. 03, 1926 | J.C. Blevney | Work holding and feeding device for grinding or polishing machines | sanding machines | |
| 2,575,656 | Nov. 20, 1951 | J.B. Dym, H.D. Coe, Jr. | Means for finishing workpieces of irregular shapes | belt sanders | |
| 2,712,204 | Jul. 05, 1955 | W.D. Roberts | Grinding apparatus of the traveling belt type | metal sanding machines | |
| 3,408,775 | Nov. 05, 1968 | R.D. Rutt | Belt sanding and polishing machine | sanding machines | |