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Combinations of pressure reducers and filters with and without backwashing; pressure reducers for controlling the operating pressure in water installations, also in industrial applications; safety valves [parts of machines] for liquid systems, solar thermal collectors, drinking water heaters and heating installations comprised in this class; clack valves [parts of machines] and valves operated by changes in pressure for liquid systems, solar thermal collectors, drinking water heaters and heating installations; all aforementioned goods not for use in irrigation systems for horticulture and agriculture. Computer software [recorded], computer programs [downloadable] and computer programs [recorded] for controlling and regulating devices for the detection of leakage and undesired flow states in pipe installations for water; pressure gauges; electric installations for the remote control of industrial operations in pipe installations for water; interfaces for computers for the connection of devices for the detection of leakage and undesired flow states in pipe installations for water with further such devices and/or a central computer; boiler control instruments; electric regulating apparatus for controlling and regulating devices for the detection of leakage and undesired flow states in pipe installations for water, also controllable through a network or by remote control; measuring apparatus for use in devices for the detection of leakage and undesired flow states in pipe installations for water; measuring apparatus for installation and control of devices for the detection of leakage and undesired flow states in pipe installations for water; apparatus and instruments for physics for use with devices for the detection of leakage and undesired flow states in pipe installations for water; central processing units for connecting and controlling of devices for the detection of leakage and undesired flow states in pipe installations for water and evaluation of data which are transmitted by such devices; electric mains monitoring apparatus for monitoring water losses in a house water installation; solenoid controls for automatically operating valves [parts of heating installations]; thermostatically controlled valves for liquid systems, solar collector systems, drinking water heaters and heating installations; pressure controllers for water pipes, namely for controlling differential pressure; dosimeters; all aforementioned goods not for use in irrigation systems for horticulture and agriculture. Backwashing systems for filters; connection flanges for fittings, pressure reducers, filters and water treatment devices; filters for drinking water, heating devices, drinking water distribution apparatus, water pipes and heating installations; devices for water treatment against limestone and for the control of water losses in domestic installations; ion exchange installations; thermostatic mixing valves for the control of the warm water temperature; safety valves for liquid systems, solar thermal collectors, drinking water heaters and heating installations comprised in this class; pressure relief and safety valves for liquid systems, solar thermal collectors, drinking water heaters and heating installations; boiler combination valve for removal of entrained air; water level cut-off switches; automatic air-vent systems; thermal safety valves; draft regulators for heating systems with solid fuel; filling assemblies for filling and re- filling hot water heating installations; system disconnectors; stop cocks for regulating water; stop cocks being safety apparatus for water apparatus; all aforementioned goods not for use in irrigation systems for horticulture and agriculture.