37 Installation of apparatus for water supply and sanitary purposes, namely, installation of hand and power tools and machine-tools, mechanical and electrical equipment, valves, faucets, gauges, filters, flow meters, pressure reducers and monitoring apparatus and devices for use in automatic systems for supplying fluids, water, electricity and gas, in medical and industrial installations, and in energy supply installations; repair of apparatus for water supply and sanitary purposes, namely, installation of hand and power tools and machine-tools, mechanical and electrical equipment, valves, faucets, gauges, filters, flow meters, pressure reducers and monitoring apparatus and devices for use in automatic systems for supplying fluids, water, electricity and gas, in medical and industrial installations, and in energy supply installations; repair and installation of apparatus for water supply and sanitary purposes, namely, repair and installation of tools and machine-tools, mechanical and electrical equipment, valves, faucets, gauges, filters, flow meters, pressure reducers and monitoring apparatus and devices for use in automatic systems for supplying fluids, water, electricity and gas, in medical and industrial installations, and in energy supply installations; assembly services in the nature of the installation of machines, machine tools and automatic systems for supplying fluids; advisory services relating to the installation, maintenance and repair of mechanical and electrical equipment; installation, maintenance and repair of apparatus for supplying fluids, water, electricity and gas; installation services for the upgrade of machines, machine tools and automatic systems for supplying fluids; installation, repair and maintenance of condensing apparatus, steam condensers, radiators for engines, air heaters, boiler tubes, valves, faucets with integrated regulators and installations comprising faucets with integrated regulators