#electric_bell  a bell activated by the magnetic effect of an electric current
  supertype:  #bell  a hollow device made of metal that makes a ringing sound when struck
  subtype:  #telephone_bell  electric bell that rings to signal a call
  part:  #electromagnet  a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet
     part:  #armature  coil in which voltage is induced by motion through a magnetic field

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