Section 13 Articles of stone, plaster,cement,asbestos, mica or similar materials; ceramic products; glass and glassware 70 Glass and glassware 70 11 Glass envelopes (including bulbs and tubes), open, and glass parts thereof, without fittings, for electric lamps, cathode ray tubes or the like Commodity Code Description 70 11 10 For electric lighting 70 11 20 For cathoderay tubes 70 11 90 Other