#piano_action__pianoaction  action consisting of a system of levers that move a felt hammer to strike the strings when a key is depressed
  supertype:  #action_mechanism__action  the operating part that transmits power to a mechanism; "the piano had a very stiff action"
  part:  #damper_block__piano_damper__pianodamper  damper consisting of a small felted block that drops onto a piano string to stop its vibration
  part:  #piano_hammer__pianohammer__hammer  a striker that is covered in felt and that causes the piano strings to vibrate

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