AL AIR LIQUIDE

apparatus for use in welding to position servos and electrical arc welders, electrodes, pressure regulators, pressure gauges, automatic gas pressure regulating valves, pressure relief valves, flow meters, regulators and indicators for gas and chemical control panels, and controls for directing the flow of gas; proportioning meters and valves for gas in industrial processes; computer controlled analyzers and computer controlled proportioning valves for gases; gas pressure regulating, flow controlling and proportioning units for the handling and administration of medical gases; gas analyzers; gas control electrical apparatus; and, computer programs for industrial and high purity gas control