#key.lever  a lever that actuates a mechanism when depressed
  supertype:  #lever  a rigid bar pivoted about a fulcrum
  part of:  #action_mechanism
  member of:  #keyboard
  subtype:  #backspace_key__backspacekey__backspacer  the typewriter key used for back spacing
  subtype:  #control_key__controlkey__command_key__commandkey  (computer science) the key on a computer keyboard that is used (in combination with some other key) to type control characters
  subtype:  #return_key__return  the key on electric typewriters or computer keyboards that causes a carriage return and a line feed
  subtype:  #space_bar__spacebar  the bar-shaped typewriter key that introduces spaces when used
  subtype:  #tab_key__tabkey  the key on an electric typewriter that causes a tabulation
  subtype:  #telegraph_key__telegraphkey  key consisting of a lever that sends a telegraph signal when it is depressed and the circuit is closed

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