#operator.causal_agent__manipulator  an agent that operates some apparatus or machine; "the operator of the switchboard"
  subtype:  #company_operator  #driver  #elevator_operator  #locomotive_engineer  #hoister  #jockey.operator  #motorman  #switchman  #telegrapher  #telephone_operator
  supertype:  #causal_agent__cause__causal_agency  any entity that causes events to happen
     supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
        supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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