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| Patents Granted on 1980-12-30 | |||||
| Number | Date | Patentee | Title | Type | |
| CA-1,092,333 | Dec. 30, 1980 | F.E. Dailey | Closed loop machining system | multiple station machines | |
| 4,242,018 | Dec. 30, 1980 | H. Schürfeld | Boring Tool | ||