#magnetic_compass  compass based on an indicator (as a magnetic needle) that points to the magnetic north
  supertype:  #compass__compas  navigational instrument for finding directions
  subtype:  #compass_card  compass in the form of a card that rotates so that 0 degrees or North points to magnetic north
  part:  #magnetic_needle  a slender magnet suspended in a magnetic compass on a mounting with little friction; used to indicate the direction of the earth's magnetic pole

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