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| All Patents in class 451/310 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,798,340 | Jul. 09, 1957 | W.D. Roberts | Apparatus for grinding internal surfaces | metal sanding machines | |
| 2,857,717 | Oct. 28, 1958 | J.W. Edgemond, Jr., J.J. O'Connor | Belt sander | belt sanders | |
| 3,859,758 | Jan. 14, 1975 | R.G. Fair, Jr. | Wide belt sanding machine | belt sanders | |