Sennheiser a#39;Tour Guidea#39; battery charger unit will accommodate the transmitter and ten receivers for overnight ... A light-weight stethoscope-earphone, together with its appropriate connecting cable, is also supplied in unit with the receiver. ... Frequency stabilization, which is essential for the operation of more than one guided-tour- intercommunication-system at the same time, on narrow channel spacinganbsp;...
Title | : | Science and Australian Technology |
Author | : | |
Publisher | : | - 1971 |
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