#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
  supertype:  #contact.junction__tangency  a junction where things (as two electrical conductors) touch or are in physical contact; "they forget to solder the contacts"
  part of:  #rheostat__variable_resistor  resistor for regulating current
  part of:  #selector_switch__selector  a switch that is used to select among alternatives

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