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| All Patents in class 451/523 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,968,215 | Jul. 31, 1934 | N.F. McNaught, E.H. Peterson | Tool for cleaning commutators and the like | ||
| 2,248,884 | Jul. 08, 1941 | J.F. McAdams | Sanding block | abrasives and holders | |
| 2,252,190 | Aug. 12, 1941 | J.F. McAdams | Sanding block | abrasives and holders | |