Combination microphone, speaker, and control unit for a radio transceiver

Abstract From the Canadian patent

Abstract of the Disclosure, A combination microphone loudspeaker, and control, unit is disclosed which is adapted to be coupled by a multiconductor cable to a radio transceiver which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies. A multi-conductor cable is secured to a housing for the unit and is adapted to electrically connect the unit to a radio transceiver. A multi-position switch is mounted in the housing and connected to the cable with the, switch being operable to select individually the preselected frequencies. An electromechanical transducer is mounted in the housing and connected to the cable and operable to convert audible sound …