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| Patents Granted on 1981-12-15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,305,440 | Dec. 15, 1981 | E. Lacasse | Cutting tool | ||
| 4,305,689 | Dec. 15, 1981 | K. Morikawa, S. Yamade | Crankshaft Milling Machine | milling machines | |