N'ebe a na-egwupụta mmanụ na mmanụ olulu mmiri, nnukwu ọkụ eletrik na-eguzogide welded casing (nke a na-akpọ ERW casing) ma e jiri ya tụnyere casing enweghị nkebi bụ ihe ziri ezi nke akụkụ dị elu, ịdị ike weld, mgbochi extrusion nke arụmọrụ dị elu, na uru dị ala, nke. ejirila ya mee ihe na mba ofesi ...
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