#key.lever  a lever that actuates a mechanism when depressed
  supertype:  #lever  a rigid bar pivoted about a fulcrum
  subtype:  #backspace_key  #control_key  #return_key  #space_bar  #tab_key  #telegraph_key
  member of:  #keyboard
  part of:  #action_mechanism__action  the operating part that transmits power to a mechanism; "the piano had a very stiff action"
     part of:  #gun  a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
     part of:  #keyboard  device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like
        part of:  #electronic_computer__computer__computing_machine__computingmachine__computing_device__computingdevice__data_processor__information_processing_system  a machine for performing calculations automatically
           part of:  #platform.computer_system  the combination of a particular computer and a particular operating system
        part of:  #pipe_organ__organ  wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard
        part of:  #forte-piano__fortepiano__piano__pianoforte  a stringed instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds
        part of:  #terminal  electronic equipment consisting of a device providing access to a computer; has a keyboard and display
        part of:  #typesetting_machine__typesettingmachine  a printer that sets textual material in type
        part of:  #typewriter  hand-operated character printer for printing written messages one character at a time

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