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| Patents Granted on 1981-03-17 | |||||
| Number | Date | Patentee | Title | Type | |
| 4,255,861 | Mar. 17, 1981 | H. Suwa, K. Nakata | Electrically Digital Display Micrometer | micrometers | |
| 4,256,295 | Mar. 17, 1981 | E.A. Egner | Adjustable Clamp | clamps | |