#main  a principal pipe in a system that distributes water or gas or electricity or that collects sewage
  supertype:  #pipe__pipage__piping  a long tube made of metal or plastic that is used to carry water or oil or gas etc.
  subtype:  #electric_main  #gas_main  #sewer_main  #water_main
  part of:  #infrastructure__base  the stock of basic facilities and capital equipment needed for the functioning of a country or area; "the industrial base of Japan"

No statement uses or specializes #main; click here to add one.