Ọdịiche dị n'etiti Asambodo Nchekwa Ngwuputa na Asambodo Nchekwa Coal

Asambodo nchekwa coal na asambodo nchekwa ogbunigwe bụ nzere nke mmanye maka akụrụngwa na ngwaahịa Ngwuputa., nke National Safety Mark Center nyere.

Asambodo nchekwa coal metụtakwara ngwaọrụ na ngwaahịa e zubere maka iji na gburugburu ebe a na-egwupụta coal.. N'aka nke ọzọ, Edebere asambodo nchekwa nke m maka akụrụngwa na ngwaahịa ejiri na ntọala ala nke ogbunigwe na-abụghị coal.