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| Patents Granted on 1981-08-04 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,281,538 | Aug. 04, 1981 | E.C. Dudek | Transducer for indicating torque | ||
| 4,281,928 | Aug. 04, 1981 | A.N. Brunson | Optical Transit Square with Focusable Crossing Telescopes | surveyor | |