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Ultra-pure gases and special gases and special gas mixtures for industrial, technical, research and science purposes, in particular gases being detection, calibration and testing gases, protective and shielding gases, reactive and active gases, being welding, cutting and scrubbing gases, being process, treatment and work gases, being gases for the treatment and processing of materials, for electronic manufacturing and process technology, in particular clean air, nitrogen, oxygen, carbon dioxide and carbon monoxide, ammonia, and saturated and non-saturated hydrocarbon gases, hydrocarbon compounds, hydrogen, noble gases, isotope gases, and special gaseous substances of various kinds, including nitrous oxide, ammonia and sulphur compounds, silanes, hydrogen compounds, volatile organic compounds, chlorine and fluorine and derivatives thereof (FCHCs/freons), nitrogen compounds, ozone, halogens, halogen compounds, boron, silicon and sulphur compounds, and mixtures of the aforesaid gases. Apparatus for supplying gas for industrial processes on a delivery gas basis (gas cylinder delivery, liquid gas delivery for gas tanks), in particular including apparatus for supplying applications with special gases, in particular connecting, regulating and safety fittings for the aforesaid gas apparatus; apparatus for separating air or other gas mixtures, apparatus for separating gases from exhaust gases or concentrating gas components, gas generators; regulating and safety fittings for gases/gas pipes, including combined with units, panels or consoles. Engineering, namely engineering services in the field of industrial product manufacturing using gases, measuring technology using gases, science and research using gases, in particular engineering consultancy, technical planning and development, and testing services in the aforesaid fields, and in relation to supplying consumption points with gases and related quality assurance.