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| Patents Granted on 1971-05-11 | |||||
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| Number | Date | Patentee | Title | Type | |
| D220,721 | May 11, 1971 | B. Stevens | Turning center | metal lathes | |
| 3,578,308 | May 11, 1971 | J. Jesionowski | Vise | metalworking machine vises | |