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, 70 11 20 GLASS ENVELOPES FOR CATHODE-RAY TUBES Commodity Code Description 70 11 20 00 GLASS ENVELOPES FOR CATHODE-RAY TUBES