Wholesalers US This industry comprises establishments primarily engaged in the merchant wholesale distribution of specialized machinery, equipment, and related parts generally used in construction, mining (except oil well), and logging activities. Illustrative Examples: Excavating machinery and equipment merchant wholesalers Road construction and maintenance machinery merchant wholesalers Forestry machinery and equipment merchant wholesalers Scaffolding merchant wholesalers Mining cranes merchant wholesalers Cross-References. Establishments primarily engaged in the merchant wholesale distribution of oil well machinery and equipment are classified in Industry 423830, Industrial Machinery and Equipment Merchant Wholesalers.