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| Patents Granted on 1981-03-03 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,253,351 | Mar. 03, 1981 | H. Allen | Cork extractor | lever cork extractors | |
| 4,253,359 | Mar. 03, 1981 | D.H. Youden | Drive System for Multiple Spindle Machine Tool | metalworking power transmission | |