The re-sale (sale without transformation) of new and used goods to retailers; to industrial, commercial, institutional or professional users; or to other wholesalers; or acting as agents in buying merchandise for, or selling merchandise to, such persons or companies. The principal types of businesses included are merchant wholesalers, i.e. wholesalers who take title to the goods they sell, such as wholesale merchants or jobbers, industrial distributors, exporters, importers, terminal elevators, and co-operative buying associations; sales branches and sales offices (but not retail stores) which are maintained by manufacturing or mining enterprises apart from their plants or mines for the purpose of marketing their products and which do not merely take orders to be filled by direct shipments from the plants or mines; merchandise and commodity brokers, commission merchants and agents; petroleum bulk stations; and assemblers, buyers, and co-operative associations engaged in the marketing of farm products. Wholesalers frequently physically assemble, sort and grade goods in large lots; break bulk, re-pack and bottle (except in air tight containers), and redistribute in smaller lots; store, refrigerate, deliver and install goods; and engage in sales promotion for customers. Also included are scrap metal, waste and junk dealers and yards. The leasing and rental of industrial machinery and equipment is classified in group 8330 (Machinery rental and leasing). The bottling of natural mineral waters at springs and wells is classified in group 3134 (Soft drinks and carbonated water industries).