#rotating_mechanism  a mechanism that rotates
  supertype:  #mechanism  device consisting of a piece of machinery; has moving parts that perform some function
  subtype:  #blade.rotating_mechanism  #cam  #circle.rotating_mechanism  #Ferris_wheel  #gyroscope  #rotor
  part:  #bearing  a rotating support placed between moving parts to allow them to move easily
  part:  #rotating_shaft__shaft  a revolving rod that transmits power or motion

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