37 Construction, installation, maintenance and repair of apparatus, machines and installations for distributing, purifying and softening water; installation, maintenance and repair of machines for making beverages, tapping installations for beer, wine and other beverages, beverage mixing and dispensing columns, columns and taps for tapping beer and other beverages in dispensing apparatus therefor, aerated beverage-making machines; installation, maintenance and repair of taps of metal, taps being parts of machines, taps being valves of metal being parts of machines, filling machines, dispensing machines other than automatic vending machines, mixing systems for dispensing beverages, namely, consisting of dispensing equipment; installation, maintenance and repair of apparatus and instruments for identifying, measuring, detecting and controlling liquids; installation, maintenance and repair of hot water boilers for making beverages, devices for dispensing refrigerated beverages other than vending machines, beverage refrigerating apparatus, refrigerated beverage dispensers other than automatic vending machines, refrigerated beverage dispensers, beverage heating installations; installation, maintenance and repair of single taps made from composite materials, individual taps made from composite materials, individual taps made from pressed steel, individual flush-mounted taps, individual taps, taps for regulating water flow, taps for water dispensing installations, mixer taps, electronically controlled water taps; installation, maintenance and repair of regulating apparatus for devices for dispensing beverages, regulating apparatus for water dispensing installations, filter apparatus for water dispensing installations, apparatus for controlling water supply, apparatus for dispensing cold beverages, apparatus for dispensing drinking water; installation, maintenance and repair of installations for dispensing drinking water, water dispensing instruments, water mixers, drip collars, refrigerated and non-refrigerated beverage dispensers, refrigerating installations for aerated and non-aerated beverages, in particular pre-mix and post-mix installations; installation, maintenance and repair of containers, not of metal, for beverages on tap, valves being taps, not of metal, for regulating the flow of liquid entering casks; installation, maintenance and repair of plastic containers for dispensing beverages, beverage containers, heat-insulated containers for beverages, portable beverage dispensers, insulated containers for beverages, drinking vessels, beverage coolers being containers, portable beverage coolers, manual household or kitchen apparatus for making aerated beverages