- Lotte Engineering and Machinery MFG. Co., LTD.
- Address:104, Wonhyoro 1 Ka
- Rinnai Korea Corporation
- Address:560-2,Sipjeong-dong ,Bupyeong-gu
- Daewoo Gas Boiler Co., Ltd.
- Address:B-506, Woolim Lion's Valley, 425, Cheongcheon-dong, Bupyeong-gu
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