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Weighing, measuring, signalling, and checking instruments, namely, scales, electric gas leakage detectors, electric emission control devices in the nature of electrostatic precipitators for reducing particulate emission in industrial applications, electric gas density sensors, electric gas density indicators, electric pressure transmitter; gas measuring equipment and apparatus, in particular in relation to pressure, absolute pressure, differential pressure, temperature, quantity of flow volume, humidity, force, acceleration, path, angle, speed, density, and concentration levels; calibrators and calibration devices, in particular pressure compensators for calibrating pressure in gas piping systems; electric switches, in particular pressure switches for monitoring, controlling, and switching hydraulic or pneumatic systems; electric switches, in particular limit switches, level switches for monitoring and controlling liquids in tanks and vessels, non-contact magnetic power switches, optical switches for electric circuits, inductive proximity switches, capacitive electrical switches, electric switches designed as float switches, electric motion sensitive switches, and electric proximity switches sensitive to metal

Gas recycling system comprised primarily of pressure swing adsorption equipment for the recovery, purification and return of gases in industrial applications