42 Scientific consultancy relating to the conservation of energy, namely, in the fields of heating, ventilation, air conditioning, and water heating; engineering consulting services in the fields of heating, ventilation, air conditioning, water heating, sanitation engineering, and energy conservation; calibration, namely, of measuring, signaling, and monitoring apparatus and instruments in related to heating, ventilation, air conditioning, water heating, and sanitation devices; technical consultancy and technical project studies with regard to new product design for measuring, signaling and checking apparatus and instruments, including detectors, pressure measuring apparatus, fluid measuring and control apparatus, thermometers not for medical purposes, thermostats, calorimeters, water level indicators, water meters, including domestic water meters, counters, meters, electrotechnical apparatus, namely, control and regulating apparatus, thermal energy meters, transmitters and receivers for electronic signals, heating, bathing and water conducting apparatus and installations, and sanitary apparatus and installations, fittings, sanitary and water fittings, in particular outlet valves, connector valves, combination fittings, safety valves, shut-off fittings, free-flow valves, piston valves, sliding stem valves, mixer tapes for water pipes, pipeline cocks, backflow preventers, spin manifolds, system-adapter valves, valve manifolds, distribution stations, pre-wall systems for sanitary installations, circulation valves, connecting fittings for water meters, water pipes and radiators, threaded fittings for sanitary pipes, radiator caps and valves, regulating and safety accessories for water pipes and water apparatus, water filtering apparatus, water dispensing apparatus, feed water aerators, valves, sliding valves and taps of metal and plastic for liquid media, flushing valves, pressure water tanks, pipe aerators, filters being parts for household or industrial installations, pipes being parts of sanitary installations, in particular pipes for heating boilers, coils being parts for heating installations, thermostat valves being parts for heating installations; computer software design and updating; installation, maintenance, repair and servicing of computer software