The Standards Organisation of Nigeria (SON), on Tuesday issued certificates of Mandatory Conformity Assessment Programme (MANCAP) to 57 companies operating in Kano, for meeting set production standards.The News Agency of Nigeria (NAN) reports that most of the companies are producers of fertilizer, rice and plastics, among others.SON’s Director-General (DG), Dr. Ifeanyi Chukwunonso-Okeke, said MANCAP has