37 Assembling of machine plants; construction of parts of buildings; installation, assembly, maintenance, repair and upkeep of electronic, electric and mechanical drives and drive components; machine diagnosis, namely, diagnosis of electric equipment; assembly services relating to the installation of electrical systems; electrical installation services, namely, installation of electrical systems; mobile maintenance services, namely, maintenance of electrical equipment; advisory services relating to the maintenance and repair of mechanical and electrical equipment; building construction consultancy; installation, assembly, maintenance, repair and upkeep of contactless electric distributors and fittings embedded in the ground