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| Patents Granted on 1981-06-23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,274,231 | Jun. 23, 1981 | J. Verega | Method and Apparatus for Dressing a Grinding Wheel | grinder dressers | |
| 4,274,309 | Jun. 23, 1981 | P.E. Lenker | Method of Manufacture of Certain Hand Wrenches and the Like | ratchet wrenches | |