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| Patents Granted on 1980-04-08 | |||||
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| Number | Date | Patentee | Title | Type | |
| D254,655 | Apr. 08, 1980 | D. Brickwood | Micrometer | micrometers | |
| 4,196,506 | Apr. 08, 1980 | R.W. Reed | Tool Changer Machining Center | tool changers and storage mechanisms | |
| 4,197,040 | Apr. 08, 1980 | W.W. Wawrzyniak | Facing and Boring Head | facing heads | |