| 摘要 |
For tightening threaded connectors (1), a plurality of fluid-operated torque tools (3) are used, each engaging with a respective threaded connector. It is sensed when at least one of the fluid-operated torque tools (3) reaches a point during an advance stroke when it permits a return ratcheting, and automatically all pistons of all fluid-operated torque tools (3) are retracted even if the remainder of the pistons of the fluid-operated torque tools are not advanced to a point when the return ratcheting of the tools is permitted.
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