#assembly.machine  a group of machine parts that fit together to form a self-contained unit
  supertype:  #machine  any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
  subtype:  #sub-assembly__subassembly  a unit assembled separately but designed to fit with other units in a manufactured product
  subtype:  #weldment  an assembly of parts welded together

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