#communication_system__communicationsystem  a system for communicating
  supertype:  #system.instrumentality__unit  instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity; "he bought a new stereo system"; "the unit consists of a motor and a small computer"
  subtype:  #ground_control  a communication system for sending continuous radio messages to an airplane pilot who is making a ground-controlled approach to landing
  subtype:  #intercommunication_system__intercom  a communication system linking different rooms within a building or ship etc
     subtype:  #interphone  a telephonic intercommunication system linking different rooms in a building or ship etc
  subtype:  #public_address_system__PA_system__PA  an electronic amplification system used as a communication system in public areas
  subtype:  #radio__wireless  a communication system based on broadcasting electromagnetic waves
     subtype:  #wireless_telegraph__radiotelegraph__radiotelegraphy__wireless_telegraphy  the use of radio to send telegraphic messages (usually by Morse code)
  subtype:  #radio_link__radiolink__link  a two-way radio communication system (usually microwave); part of a more extensive telecommunication network
     subtype:  #walkie-talkie__walky-talky__walkytalky  small portable radio link (receiver and transmitter)
  subtype:  #telecommunication_system__telecommunicationsystem__telecommunication_equipment__telecommunicationequipment  a communication system for communicating at a distance
     subtype:  #television_system__television  a telecommunication system that transmits images of objects (stationary or moving) between distant points
        subtype:  #cable_television_service__cable__cable_television__cabletelevision__cable_system__cablesystem  a television system transmitted over cables
        subtype:  #closed-circuit_television  a television system that is not used for broadcasting but is connected by cables to designated monitors (as in a factory or theater)
           subtype:  #surveillance_system  a closed-circuit television system used to maintain close observation of a person or group
        subtype:  #color_television_system__color_television__colortelevision__colour_television__colour_television_system__color_TV__colour_TV  a television that transmits images in color
           subtype:  #field-sequential_color_television_system__field-sequential_color_television__field-sequential_color_TV__field-sequential_color_TV_system  an early form of color TV in which successive fields are scanned in three primary colors
  subtype:  #telephone_system__telephonesystem__phone_system__phonesystem  a communication system that transmits sound between distant points
     subtype:  #MEDLINE  the computer-based telephone system of the U.S. National Library of Medicine that provides rapid linkage to MEDLARS

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