| 摘要 |
There is disclosed a control system particularly adapted for use on a construction site. The system provides a two wire telephone communication path implemented via a control unit. The control unit selectively operates controlled apparatus employed to perform a monitored task. If a dangerous situation arises, either user can inactivate the controlled apparatus by means of a button located on the telephone handset. If the communication lines are damaged or broken, operation of the controlled apparatus automatically ceases. The control unit enables the users to continue operation of the controlled apparatus after the situation has been corrected or the necessary repairs to the phone lines made.
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