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| Patents for Howard W. Renner | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,599,376 | Aug. 17, 1971 | R. Grzymek, H.W. Renner | Apparatus for Automatic Grinding | grinders | |
| 3,694,971 | Oct. 03, 1972 | J.A. Moores, H.W. Renner | Guard System for High Speed Grinder | grinders | |