37 Construction services in the field of public utility and telecommunication facilities, namely, planning, laying out, custom construction, renovation, installation, maintenance, and repair of public utility and telecommunication facilities, buildings, roads, streets, pavements, ducts, manholes, utility lines, utility equipment, electric lines, electrical equipment, , cable lines, telephone lines, telecommunication lines, telecommunication equipment and telecommunication towers, telephone and earth moving and excavation; digging of trenches; boring, drilling and plowing of earth; installation of bridges and river crossings