Industrial Supplies Merchant Wholesalers This industry comprises establishments primarily engaged in the merchant wholesale distribution of supplies for machinery and equipment generally used in manufacturing, oil well, and warehousing activities. Industrial containers merchant wholesalers Industrial diamonds merchant wholesalers Industrial sand merchant wholesalers Printing inks merchant wholesalers Refractory materials (e.g., brick, blocks, shapes) merchant wholesalers Welding supplies (except welding gases) merchant wholesalers