This industry comprises establishments primarily engaged in the merchant wholesale distribution of specialized equipment and supplies of the type used by service establishments (except specialized equipment and supplies used in offices, stores, hotels, restaurants, schools, health and medical facilities, photographic facilities, and specialized equipment used in transportation and construction activities). Merchant wholesale distribution of janitorial and automotive chemicals--are classified in Industry 424690, Other Chemical and Allied Products Merchant Wholesalers; Merchant wholesale distribution of piece goods, fabrics, knitting yarns (except industrial), thread and other notions--are classified in Industry 424310, Piece Goods, Notions, and Other Dry Goods Merchant Wholesalers; and Merchant wholesale distribution of industrial yarns--are classified in Industry 424990, Other Miscellaneous Nondurable Goods Merchant Wholesalers.