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Mapaipi owala & osawoneka
Wofesa & wosawoneka bwino - magiredi osiyanasiyana mu alloy chitsulo, chitsulo chosapanga dzimbiri, chikho chopanda kanthu, duplex shales, zitsulo zosapanga dzimbiri. Malinga ndi Asther-106, API 5 L, Asthem A53, Astm A-333 ) Ochotsa, LSAW, HSAW, Efw malinga ndi API 5L, Astme A53 / 672, BS1387, DID 24 ...
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