37 turnkey installation of complete drying lines consisting of industrial drying machines of drying wood chips and agricultural products and for grinding and granulating wood chips and agricultural products, repair and maintenance of complete drying lines, consisting of drying machines, cyclones for removing dust, washers and dryers for gases, ventilators, valve boxes for recycling drying gases, conduits for fumes, conveyors and feed screw for conveying undried products to dryers, screw conveyors for dried products, grinders for wood chips and agricultural products, and pelletizing presses; repair and maintenance of complete drying lines, consisting of drying machines, cyclones for removing duct, washers and dryers for gases, ventilators, valve boxes for recycling drying gases, conduits for fumes, conveyors and feed screws for conveying undried products to dryers, screw conveyors for dried products, grinders for wood chips and agricultural products, and pelletizing presses for grinding and granulating wood chips and agricultural products