| 摘要 |
There is provided automatic switch means responsive to an audio output or an 'on' state of an audio unit for turning off the power supply to another audio unit and concomitantly diverting or switching the output from the first-mentioned audio unit to the electrical-acoustic transducer which was previously supplied from the output of the second-mentioned audio unit. The invention has particular, but not inclusive, use in turning off an automobile radio when a tape-recorder is switched on and switching the outputs so that a common loudspeaker system may be used.
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