#contractor  someone (a person or firm) who contracts to build things
  supertype:  #builder__developer__constructor  someone who contracts for and supervises the construction of a building
  subtype:  #defense_contractor__defensecontractor  a contractor concerned with the development and manufacture of systems of defense
  subtype:  #hauler__haulier  a haulage contractor
     subtype:  #garbage_carter__garbagecarter__carter__garbage_hauler__garbagehauler  a hauler of garbage; "there is a web site where licensed carters and would-be customers can make connections"
  subtype:  #ship-breaker  a contractor who buys old ships and breaks them up for scrap
  subtype:  #subcontractor  someone who enters into a subcontract with the primary contractor

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