#action_mechanism__action  the operating part that transmits power to a mechanism; "the piano had a very stiff action"
  supertype:  #mechanism  device consisting of a piece of machinery; has moving parts that perform some function
  subtype:  #gunlock  #movement.action_mechanism  #piano_action  #pump_action
  part of:  #gun  #keyboard
  part:  #key.lever  a lever that actuates a mechanism when depressed

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