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| All Patents in class 451/276 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,606,405 | Aug. 12, 1952 | R.S. Ohl | Polishing Means and Method | polishing and buffing machinery | |
| 3,543,445 | Dec. 01, 1970 | J.R. Southland, E. Borchert, III | Apparatus for grinding drills | drill grinders | |