3271

Clay Product and Refractory Manufacturing

This industry group comprises establishments primarily engaged in (1) shaping, molding, glazing, and firing pottery, ceramics, and plumbing fixtures, and electrical supplies made entirely or partly of clay or other ceramic materials or (2) shaping, molding, baking, burning, or hardening clay refractories, nonclay refractories, ceramic tile, structural clay tile, brick, and other structural clay building materials.

3272

Glass and Glass Product Manufacturing

3273

Cement and Concrete Product Manufacturing

This industry group comprises establishments primarily engaged in one of the following: (1) manufacturing portland, natural, masonry, pozzolanic, and other hydraulic cements; (2) acting as batch or mixing plants, manufacturing concrete delivered to a purchaser in a plastic and unhardened state; (3) manufacturing concrete pipe, brick, and block; or (4) manufacturing other concrete products (except block, brick, and pipe).

3274

Lime and Gypsum Product Manufacturing

This industry group comprises establishments primarily engaged in (1) manufacturing lime from calcitic limestone, dolomitic limestone, or other calcareous materials or (2) manufacturing gypsum products.

3279

Other Nonmetallic Mineral Product Manufacturing

This industry group comprises establishments manufacturing nonmetallic mineral products (except clay products, refractory products, glass products, cement and concrete products, lime, and gypsum products).