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Tirathai Public Company Limited operates as a manufacturer of electric transformers according to customers' orders for distribution to both domestic and international including services provider of transformer installation, maintenance, and testing. The company is the sole domestic manufacturer who can produce both power transformers and distribution transformers and has received the transfer of manufacturing technology from Siemens Transformer Austria GmbH & Co KG of Austria; and Fuji Electric Systems Co., Ltd. of Japan, the world's leading manufacturers of electric transformers.