INSTALLATION AND MAINTENANCE OF THE FOLLOWING TYPES OF EQUIPMENT: MILLS FOR PROCESSING FEEDS, AND MILLING EQUIPMENT-NAMELY, ELEVATORS, CONVEYORS AND PARTS THEREOF, MIXERS AND PULVERIZERS, TRUCK HOISTS AND BRIDGES, GRAIN DRYERS, STORAGE TANKS AND OTHER CONTAINERS FOR DRY AND WET MATERIALS; IRRIGATION EQUIPMENT; AND HOME APPLIANCES