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| Patents Granted on 1971-08-03 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,596,569 | Aug. 03, 1971 | J.D. Wisbey | Valve for a Closed-Loop Hydraulic Torque Amplifier | hydraulic apparatus | |
| 3,596,917 | Aug. 03, 1971 | H.F. Meyer | Tool adapter | ||