ANALYSIS AND MEASUREMENT EQUIPMENT FOR THE NATURAL GAS, CHEMICAL, PETROCHEMICAL AND OIL REFINING INDUSTRIES, namely, EQUIPMENT USED IN THE MEASUREMENT OF INDIVIDUAL ORGANIC SULFUR COMPOUND CONCENTRATIONS IN PROCESSED NATURAL GAS, LIQUEFIED PETROLEUM GASES, AND REFINED LIQUIDS IN THE NATURE OF HYDROGEN SULFIDE, CARBONYL SULFIDE, METHYL MERCAPTAN, ETHYL MERCAPTAN, NORMAL-PROPYL MERCAPTAN, ISO-PROPYL MERCAPTAN, NORMAL-BUTYL MERCAPTAN, SECONDARY-BUTYL MERCAPTAN, ISO-BUTYL MERCAPTAN, TERTIARY-BUTY...