Daekyung Machinery & Engineering Co., Ltd. Doosan Mecatec Co., Ltd. Seoul Plant Co., Ltd. Sungjin Machinery Co., Ltd. Sewon E & T Co., Ltd. Ilsung Engineering Co., Ltd. Hankook Energy Co., Ltd. Hanjung DCM Co., Ltd. Hantec Engineering Co., Ltd. Daewon Heat Plate Co., Ltd. Daechang HRSG Co., Ltd. Bumwoo Engineering. Co., Ltd. Bokuk Industrial Co., Ltd. Sedae-Kisan Co., Ltd. Wooyang Machinery Co., Ltd. Wonil T & I Co., Ltd. Yooyang Tech Co., Ltd. Ihwa Machinery Tech Co., Ltd. Iljin Engineering & Construction Co., Ltd. JMC Co., Ltd. Taebong Industrial Co., Ltd. TSM Tech Co., Ltd. Hwasung Plant Co., Ltd. Hanjin Co., Ltd Kursan Plant Co., Ltd. Kwangshin Tech Co., Ltd. Gookdo Machinery Co., Ltd. Keukdong Enertec co., Ltd. Kibo Industrial Co., Ltd. Deadoo Co., Ltd. Daelim Industrial Co., Ltd. Daebong Industrial Co., Ltd. DEO Co., Ltd. Samho Boiler Co., Ltd. Seaki Precision Co., Ltd. Soltec Co., Ltd. Soowoon Precision Ind. Co., Ltd. Shinsung Plant Co., Ltd. Sinjungwoo Industrial Co., Ltd. Shinhan Heat Exchanger Co., Ltd. Shinhan Engineering Co., Ltd. Advance Filter Tech Co., Ltd. Woojin Fluid Machinery Co., Ltd. Woojin Precision Industry Co., Ltd. Jungwoo Industrial Machine Co., Ltd. Jinsung Machinery Co., Ltd. Changjin Plant Co., Ltd. Hi-tech Fluid Co., Ltd. Taekwang Industrial Machine Co., Ltd. Hankook Heat Exchanger Industry Co., Ltd. Hanjoo Machinery Co., Ltd Hanjung CIT Co., Ltd. Hyundai Machienry Tech Co., Ltd. Environment Technology Co., Ltd. Advance & Basic Co., Ltd.