This industry group comprises establishments primarily engaged in (1) shaping, molding, glazing, and firing pottery, ceramics, and plumbing fixtures whether made entirely, or partly of clay or other ceramic materials; and (2), shaping, molding, baking, burning, or hardening clay refractories, nonclay refractories, ceramic tile, structural clay tile, brick, and other structural clay building materials. Examples of products produced in these industries are vitreous, china, and earthenware bathroom accessories; vitreous china and fine earthenware table and kitchen articles, art and ornamental items, and stoneware; porcelain electrical insulators, molded porcelain parts for electrical devices, and ferrite or ceramic magnets; brick and structural clay tiles, ceramic wall and floor tiles, clay sewer pipe, drain tile, flue lining, architectural terra-cotta and other structural clay products; and finally, clay and nonclay refractories.