Lemekezani satifiketi Mabizinesi 10 apamwamba Iso9001 Iso14001 Iso45001 Mabizinesi 50 Opambana M'makampani Opepuka a China Chitsimikizo cha Management Chitsimikizo cha chilengedwe Ntchito Yokhala Nawo ndi International System Patent yakale