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I Piece Parts Sub Assembly + Cover Painted( If applicable) Metals and plastics together shipped as Case Metals and Plastics + PSU and /or Flat Cable and /or Backplane shipped as kit/bag Some Cable Assembly Backplane Level V All enclosure parts from Level IV attached, cables integrated, I/O tested Desktop ILA Level ( V I ) Ass’y M/B Into Chassis Enclosure ( VI ) amp。 Power on test Level ( VII ) Asse