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Compressed gases and gas mixtures for industrial use other than as fuel, namely, stabilized methylacetylene and propadiene mixtures, propylene and acetylene gas, oxygen, breathing air, nitrogen, argon, helium, hydrogen, carbon dioxide, and tri-mix and specialty gas mixtures combining the foregoing; propylene and acetylene gas used in welding and cutting

Fuel gases, namely, acetylene, propylene, hydrogen, and a mixture of stabilized methylacetylene and propadiene

Maintenance of pressurized gas and liquid containment cylinders, namely, shot blasting of cylinders, painting, internal and external cleaning, neck ring replacement and disposal of condemned cylinders; cylinder requalification, namely, repair of pressurized gas cylinders; cylinder gas conversion, namely, conversion of liquid cylinders to gas and gas cylinders to liquid; filling of gas storage cylinders and containers for others

Product testing and inspections, namely, hydrostatic testing for leaks in pressurized gas and liquid containment cylinders; cylinder requalification, namely, material testing to determine the reusability of pressurized gas and liquid containment cylinders; inspection of pressurized gas and liquid containment cylinders