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, Commodity Code Description 70 11 10 GLASS ENVELOPES(INCL. BULBS & TUBES) FOR ELECTRIC LIGHTING................ 70 11 20 GLASS ENVELOPES FOR CATHODE-RAY TUBES 70 11 90 OTHER GLASS ENVELOPES (INCL. BULBS & TUBES), OPEN, & GLASS PARTS THEREOF..