#selector_switch__selector  a switch that is used to select among alternatives
  supertype:  switch__switch_device  control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit
  subtype:  telephone_dial  a disc on a telephone that is rotated a fixed distance for each number called
  part:  wiper_arm__wiperarm__wiper__contact_arm__contactarm  contact consisting of a conducting arm that rotates over a series of fixed contacts and comes to rest on an outlet

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