This industry comprises (1) establishments primarily engaged in the merchant wholesale distribution of manufactured homes (i.e., mobile homes) and/or prefabricated buildings and (2) establishments primarily engaged in the merchant wholesale distribution of construction materials (except lumber, plywood, millwork, wood panels, brick, stone, roofing, siding, electrical and wiring supplies, and insulation materials). Illustrative Examples: Flat glass merchant wholesalers Prefabricated buildings (except wood) merchant wholesalers Ornamental ironwork merchant wholesalers Wire fencing and fencing accessories merchant wholesalers Plate glass merchant wholesalers Cross-References. Establishments primarily engaged in--