Class Physical apparatus for weighing and parts therefor, optical weighing, measuring, signalling, checking, regulating and monitoring devices, apparatus and instruments, namely, pressure relief valves for industrial applications, self-operated pressure regulators for pressure control in valves for industrial applications, electric signal converters for positioners ensuring a predetermined assignment of the valve position to the input signal in industrial applications, pressure sensors and thermostats and parts therefor; pressure and thermo regulators with electric switches for pressure control of gases and liquids, namely, pneumatic and electro-pneumatic flow regulators of valves for industrial use; flow meters, fluidimeters in the nature of flow meters, gas counters in the nature of gas meters, water level indicators, electrical transducers, thermometers not for medical purposes, manometers, low-water alarms in the nature of alarm sensors; heat counters in the nature of electric control devices for heating and energy management, steam meters in the nature of electric meters, thermostats, safety thermostats, room thermostats, heat and temperature detectors in the nature of temperature sensors, hygrostats in the nature of hygrometers; differential pressure meters in the nature of pressure gauges, flow meters and level meter for liquids; control units, namely, temperature control devices for machines, pipelines, engines, flow regulators for industrial use, and room temperature control devices; electric high-speed circuit breakers, pneumatic remote controls for teleadjustment or distance control or teleautomatics of valves, throttles, blinds and other shut-off, regulating, and monitoring equipment; electric actuators and control gears for adjustment, control and switching of valves, cut-off valves and gate valves, electrical controlling equipment and pneumatic measuring and regulating devices for pressure control; electrical controllers and regulators and their structural or replacement parts for the automation of industrial operations and equipment produced thereof by using pneumatic, hydraulic, electric or mixed signals and impulses; pneumatic, hydraulic, electric and mechanic switches, microcircuits and change-overs in the nature of electric and electronic circuits and change-over switches, calculators, main driving switches in the nature of electric switches, switch cupboards being switch boxes; apparatus for recording, data storage and reading of pneumatic, hydraulic and electric signals, data and measured value and other technical information, apparatus for input and output of digital or analogue physical quantity; digital to analogue converters, digitizers in the nature of analogue to digital converters, analogue indicators being analog multimeters, pneumatic measuring instruments for measuring pressure of gas and liquids, control and regulating apparatus, namely, pressure regulators within industrial applications, in particular for attachment to actuators and valves and pressure and temperature control apparatus for industrial applications and industrial automation controls, namely, pneumatic control of automation of workflow for process engineering, production engineering and for machine tools, pneumatic keys and pneumatic switch keys, pneumatic drop signals; binary amplifiers, power switches, count-up Geiger counters, transmitters of electronic signals; automatic pneumatic valves, control valves for regulating the flow of gases and liquids, automatic three-way valves, electric relays, chokes in the nature of choking coils for use in electrical apparatus, fine chokes in the nature of choking coils for use in electrical apparatus, differential pressure switches for monitoring, controlling and switching hydraulic or pneumatic systems and time lag electric relays; electronic universal regulators for rheostatic teletransmitters, electronic humidity regulators, electronic synchronization controllers for actuators; electric actuators and positioners being receivers of electric signals, electric differential pressure switches, pneumatic and electro-pneumatic components, namely, automatic valves for industrial applications, self-operated flow regulators for control of gases in industrial applications, electric signal converters as positioners of valves in industrial applications, electric sensors and thermostats; electric measuring transducers for pressure for industrial applications, pneumatic limiting signal transmitters, electrical regulating apparatus, namely, field rheostats, measuring instruments and counting apparatus; electronic heating and ventilation controllers and electronic temperature and differential temperature controllers; electrical or electronic apparatus for controlling the pressure and flow of liquids, air, gases and vapours, in particular for use in firing installations, boiler control instruments, district heating supply installations and for cooling motors; 021; 023; 026; 036; 038