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| Patents Granted on 1979-05-15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,154,396 | May 15, 1979 | E.E. Kirkham | Digital Data Reader | machine tool controls | |
| 4,154,555 | May 15, 1979 | F.C. Skrentner | Multiple Boring Head | boring heads | |