NEWSLETTER, PERIODICALS, BROCHURES, AND PAMPHLETS ON THE SUBJECT OF TESTING AND BALANCING OF HEATING, VENTILATING, AND AIR-CONDITIONING (HVAC) SYSTEMS, A MANUAL OF NATIONAL STANDARDS FOR TESTING AND BALANCING OF HVAC SYSTEMS, AND A MANUAL OF TEST AND BALANCE PROCEDURES

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DIAGNOSTIC SERVICES, NAMELY, INDEPENDENT TESTING AND BALANCING OF HEATING, VENTILATING, AND AIR-CONDITIONING (HVAC) SYSTEMS

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