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ROYAL THAI GOVERNMENT
MINISTRY OF COMMERCE
MINISTRY OF LABOUR
DEPARTMENT OF BUSINESS DEVELOPMENT
THE REVENUE DEPARTMENT
THE COMPTROLLER GENERAL’S DEPARTMENT (CGD)
SOCIAL SECURITY OFFICE
THE ENGINEERING INSTITUTE OF THAILAND
COUNCIL OF ENGINEERS
THE CONSULTING ENGINEERS ASSOCIATION OF THAILAND
ENVIRONMENTAL ENGINEERING ASSOCIATION OF THAILAND
THE ASSOCIATION OF SIAMESE ARCHITECTS UNDER ROYAL PATRONAGE
AIR CONDITIONING ENGINEERING ASSOCIATION OF THAILAND