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Maintenance of trays, nozzles, pipes, and flanges for facilities in the chemical, petrochemical, oil and gas industries; machinery repair; installation services for facilities in the chemical, petrochemical, oil and gas industries, namely, installation of tower internals, namely, trays, support plates, or bodies of metal, plastic, or ceramic for use as filler bodies in columns or towers during chemical or physical processes, vessels, pipes, mist eliminators, and structured and random packing; and removal services for facilities in the chemical, petrochemical, oil and gas industries, namely, the removal of trays, mist eliminators, structured and random packing, and tower internals