#production_line__assembly_line__line  mechanical system in a factory whereby an article is conveyed through sites at which successive operations are performed on it
  supertype:  mechanical_system  a system of elements that interact on mechanical principles
  part:  conveyer_belt
  part of:  factory__mill__manufacturing_plant__manufacturingplant__manufactory  a plant consisting of buildings with facilities for manufacturing

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