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Currently, the Company is holding shares in 3 subsidiary companies that supply the transformer's components to the Company. They are as follows;
- Thai Fin Co., Ltd., located in Bangpu Industrial Estate, is operating a business of manufacturing, distribution, repairs, and maintenance of transformer tank body and accessories including cover, fins, clamps, etc., and has manufactured and distributed the products to the Company only. The Company has increased its investments in Thai Fin Co., Ltd., totally 5 million Baht in September 2006 for purchase and improvements of tools, machineries, and factory buildings in order to meet the expansion of production capacity; as a result, Thai Fin Co., Ltd., has its paid-up registered capital of totally 15 million Baht which TRT holds 99.99% of Thai Fin's common shares.
- Tirathai E&S Co., Ltd., is providing distribution, installation and maintenance services of electrical power equipment and being established under the business plan as a separated business unit in order to increase the flexibility of management and competitions in the markets. Tirathai E&S Co., Ltd., had now started its operation since 3rd quarter 2010. TRT E&S currently has its paid-up registered capital of 5 million Baht which TRT holds 99.99% of TRT E&S common shares.
- L.D.S Metal Work Co., Ltd. Located in Bangpu Industrial Estate. Its nature of business provides general custom metal work service, specialized in large size casing transformer. The largest casing transformer LDS currently produced is 300 MVA. TRT had been approved to enter into the transaction to purchase 85% of common share in L.D.S Metal Works Co., Ltd by EGM No.1/2012 held on 5 October 2012 in order to secure the procurement of main raw material and to cope up with the business expansion as specified in 5 years business plan.