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COMPRESSED SPECIALTY GASES, NAMELY PURE GASES AND GAS MIXTURES USED FOR RESEARCH, MEDICAL TESTING, PROCESS CONTROL, ENVIRONMENTAL EMISSIONS MONITORING, INSTRUMENT CALIBRATION AND REFERENCE STANDARD PURPOSES, EXCEPT GASES SOLD FOR BREATHING PURPOSES

INSTRUMENTS FOR MEASURING AND ANALYZING GASES AND GAS-HANDLING EQUIPMENT, NOT INCLUDING EQUIPMENT SOLD FOR BREATHING PURPOSES, NAMELY; REGULATORS, FLOWMETERS AND VALVES

ENVIRONMENTAL TESTING AND CONSULTING SERVICES