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| All Patents in class 451/121 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,012,380 | Dec. 12, 1961 | R.M. Bell, M.M. Bass | Table extension for a grinding machine | ||
| 3,245,176 | Apr. 12, 1966 | A.A. Muehling | Grinding machine | ||
| 3,418,758 | Dec. 31, 1968 | J. McEwan | Oscillating vertical spindle sander | oscillating spindle sanders | |
| 3,543,445 | Dec. 01, 1970 | J.R. Southland, E. Borchert, III | Apparatus for grinding drills | drill grinders | |
| 4,547,996 | Oct. 22, 1985 | D.A. Winski | Jig Grinder With Automatic C-Axis Feedrate Control | jig grinders | |