#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
  part of:  action_mechanism
  member of:  keyboard  device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like

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