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A, B, X42, X46, X52, X56,
X60, X65, X70, X80
L245, L290, L360, L415, L450 		API SPEC 5L
GB/T9711.1
GB/T9711.2 		∮32-1240*
3-100






Longtaidi . .

  • . . .
  • . API CE ISO9001 ISO14001 OHSAS18001 .