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Nga piihi me nga paipa ngawari
Ko te whakaranu - he koretake - he kowiri tira, he kowhatu-nikel, kopuhiko, he kowiri tira me te kowiri tira me te kowiri tira. Hei ki te ASTM-106, API 5 L, Astm A53 Grade A / B, Astm A-335, Din 2445/2441 / 3687 mm to 2000 mm ) Erw, Lsaw, Hsaw, EFW, E ai ki a API 5L, ASM A53 A5: Astm A671 / 672, Astm A6787, BS1387, BS1387, DIN 24 ...