Customs exemption limits duty on oleo pine resin imports to a 25% ad valorem rate for specified manufacturing uses. Central Government exempts imports of oleo pine resin from customs duty in excess of the amount calculated at 25% ad valorem when imported for the manufacture of gum resin and turpentine, exercising powers under section 25(1) of the Customs Act, 1962; the exemption is limited in time and ceases at the end of 1988.