The manufacture of primary iron and steel products, consisting of all processes from smelting in blast furnaces to the semi-finished stage in rolling mills and foundries, that is, the production of billets, blooms, slabs or bars; hot and cold rolling and drawing into basic forms such as sheets, tin-plate, terne-plate and black-plate, strips, tubes and pipes, rails, rods; and wire rods and heavy gauge wires castings and forgings. Establishments primarily engaged in manufacturing ferrous wire and wire products from purchased rods are classified in group 3819 (Manufacture of fabricated metal products except machinery and equipment n.e.c.). The foundries included here are part of establishments primarily engaged in producing and rolling of iron and steel or are primarily engaged in manufacturing castings and forgings for sale to others. Foundries in establishments primarily engaged in the manufacture, e.g., stamping, pressing, machining assembling, of a given class of goods, are included in the group to which the parent establishment is classified. Also included are coke ovens which are associated with blast furnaces and which can not be separately reported. Coke ovens which can be separately reported are classified in group 3540 (Manufacture of miscellaneous products of petroleum and coal).