#elevator_operator  an operator of an elevator
  supertype:  #operator.causal_agent__manipulator  an agent that operates some apparatus or machine; "the operator of the switchboard"
  subtype:  #elevator_girl  a girl employed to operate an elevator
  subtype:  #elevator_man__elevator_boy__liftman  a man employed to operate and elevator; "in England they call an elevator man a liftman"

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