The driver's box is interesting. It's labelled 'CALL COMMANDER' and has a push button. If the 19 set is set to intercom the driver can hear and speak to the crew through his headset. If the 19 set is set to 'A' (long range) or 'B' (short range he is of of the loop. He must press the button on his control unit which activates a buzzer in the headset of the crew talking on the A or B sets and they must switch back to intercom to hear him.
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