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| All Patents in class 91/3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,361,460 | Oct. 31, 1944 | J. Daugherty | Hydraulic Feed and Traverse | hydraulic apparatus | |
| 3,363,366 | Jan. 16, 1968 | M.R. Estabrook | Abrading machine | ||
| 3,447,306 | Jun. 03, 1969 | J. Zigmant | Abrading machine | ||