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| Domestic Group Companies |
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·Tamano Consultants Co., Ltd.
·Nippon Civic Consulting Engineers Co., Ltd.
·NEPCO Ltd.
·DSI Co., Ltd.
·KRI International Corporation
·Nippon Koei U. K. Co., Ltd.
·Nippon Koei Latin America-Caribbean Co., Ltd.
·Nippon Koei Power Systems Co., Ltd.
·S2m-Japan Co., Ltd.
·Flexible Energy Service Co., Ltd.
·Nikki Corporation
·Koei System Inc.
·El Koei Co., Ltd.
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| Overseas Affiliated Companies |
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·DSI VIETNAM Co., Ltd.
·Philkoei International, Inc. (the Philippines)
·Vietconsult International Corp. (Viet Nam)
·P.T. Indokoei International (Indonesia)
·Thaikoei International Co., Ltd (Thailand)
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