#spark_gap__sparkgap  the gap between two high-potential terminals
  supertype:  #gap.opening__crack  a narrow opening; "he opened the window a crack"
  part of:  #induction_coil__inductioncoil  a coil for producing a high voltage from a low-voltage source
     part of:  #transformer  an electrical device by which alternating current of one voltage is changed to another voltage

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