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| Patents for Paul J. Gruber | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,263,374 | Aug. 02, 1966 | P.J. Gruber, A.D. Stuckey | Roll Grinder Comparator Gauge | ||
| 3,309,821 | Mar. 21, 1967 | R. Grzymek, P.J. Gruber | Automatic Work Loading Mechanism for Machine Tools | ||
| 3,422,583 | Jan. 21, 1969 | P.J. Gruber, A.D. Stuckey | Method for Positioning a Roll on a Roll Grinder | ||