37 Construction and maintenance of power plants, gas power plants, coal power plants, industrial power plants, refineries, chemical plants, incinerators, paper manufacturing plants, sugar refineries, rolling mills, steel production plants, foundries; construction consultation in the nature of analyzing vulnerable areas in the construction of power plants, gas power plants, coal power plants, industrial power plants, refineries, chemical plants, incinerators, paper manufacturing plants, sugar refineries, rolling mills, steel production plants, foundries; construction remodeling in the nature of modernizing power plants, gas power plants, coal power plants, industrial power plants, refineries, chemical plants, incinerators, paper manufacturing plants, sugar refineries, rolling mills, steel production plants, foundries; technical consultation in the field of constructing and maintaining power plants, gas power plants, coal power plants, industrial power plants, refineries, chemical plants, incinerators, paper manufacturing plants, sugar refineries, rolling mills, steel production plants, foundries