Neo Pipes & Tubes Co Ltd · West Bengal Text Book Corporation Limited · Saraswaty Press Limited · Greater Calcutta Gas Supply Corpn Ltd · National Iron & Steel Company (1984) Ltd. · West Bengal Pharmaceutical & Phytochemical Development Corporation Ltd · West Bengal Industrial Development Corpn Ltd · West Bengal Mineral Development And Trading Corp Ltd · Durgapur Chemicals Ltd · U75142 Wb1967 Ptc026988 · U14107 Wb1973 Plc028707 · U24231 Wb1974 Plc029335 · U99999 Wb1987 Ptc043535