Indicates Corning Glass Works manufactures incandescent light bulbs, thermometer tubing, railroad and marine glassware, traffic signal glasses, optical glass, tubing, cane x-ray shields, glass lighting fixtures, Pyrex industrial products, Pyrex laboratory glassware, Pyrex oven door panels, Pyrex ovenware, Pyrex nursing bottles, Pyrex teapots, Pyrex radio insulators, Pyrex line insulators, Pyrex laboratory apparatus, Steuben art glass.