ASTM A513- ASTM A519 ASTM A520 ASTM A524 ASTM A513- ASTM A519 ASTM A520 ASTM A524 ASTM A530 6 i ze i ok terniz borular ... ASTM A53 ASTM Al 06 Sonda. ve muhafaza borularl (tubin , casin )

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