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| Patents Granted on 1981-05-05 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,265,282 | May 05, 1981 | J.O. Lenz | Tubular rotating cutter | carving machines | |
| 4,265,356 | May 05, 1981 | C.G. Glover | Apparatus for Combining Articles from Plural Lanes into a Single Lane | conveyors and hoppers | |
| 4,266,120 | May 05, 1981 | R. Johnstone | Unmanned Machining Center With Tool Checking | numerically controlled milling machines | |