Otaki Gas Co., Ltd.
Head Office	661 Mobara, Mobara City, Chiba 297-8567 Japan Telephone 81-475-24-0010
Established	August 13, 1956
Capital	¥2.244 billion
Business	Supply, distribution and sales of city gas Sales of gas equipment Construction of gas facilities
Stock Exchange Listing	Tokyo Stock Exchange, Second Section
Homepage	http://www.otakigas.co.jp/

Kanto Construction Co., Ltd.
Head Office	661 Mobara, Mobara City, Chiba 297-0026 Japan Telephone 81-475-24-2262
Established	July 2, 1976
Capital	¥70 million
Business	Engineering, construction, pipe laying, well drilling, designing and other construction work Soil and water quality surveys Work related to pollution prevention

Otaki Sangyo Co., Ltd.
Head Office	661 Mobara, Mobara City, Chiba 297-0026 Japan Telephone 81-475-24-0161
Established	December 15, 1970
Capital	¥50 million
Business	Production and sales of compressed natural gas Sales of liquified petroleum gas (LPG) Operation of LPG distribution centers Operation of auto gas stations

Kanpatsu Service Co., Ltd.
Head Office	661 Mobara, Mobara City, Chiba 297-0026 Japan Telephone 81-475-22-5553
Established	October 1, 1983
Capital	¥10 million
Business	Leasing Credit sales and services Non-life insurance services

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Techno Earth Corporation
Head Office	33-1 Shinden-cho, Chuo-Ku, Chiba City, Chiba 260-0027 Japan Telephone 81-43-245-9991
Established	January 20, 1984
Capital	¥100 million
Business	Soil and water surveys Geopollution surveys and related remedial work Well drilling/Electric logging/Bottom hole surveys Water jet and down-hole color video camera work
Homepage	http://www.technoearth.co.jp/

KNG AMERICA, INC.
Head Office	Salt Lake City, Utah, U.S.A. Telephone 81-3-3241-5175 (Tokyo Office)
Established	August 14, 1985
Capital	US$1.001 million
Business	Petroleum and gas exploration, development and sales Exploration and development of other natural resources

Boso Computer Service Co., Ltd.
Head Office	661 Mobara, Mobara City, Chiba 297-0026 Japan Telephone 81-475-24-4234
Established	December 1, 1986
Capital	¥20 million
Business	Data processing and information distribution Development and sales of software Office automation, information and communication services

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Nihon Tennen Gas Co.,Ltd.
Head Office	4-15-11 Nihonbashi Honcho, Chuo-ku, Tokyo 103-0023 Japan Telephone 81-3-3663-6391
Established	February 25, 1940
Capital	¥300 million
Business	Development, production, and distribution of natural gas Production and sale of iodine Production and sale of iodine compounds
Homepage	http://www.ntgas.co.jp/

Kazusa Boring Corporation
Head Office	943 Nakanoshima-cho, Mobara City, Chiba 297-0034 Japan Telephone 81-475-24-3211
Established	July 9, 1956
Capital	¥30 million
Business	Well drilling

Shinei Engineer Corporation
Head Office	1352-3 Gosho, Ichihara City, Chiba 290-0066 Japan Telephone 81-436-43-3221
Established	June 20, 1988
Capital	¥10 million
Business	Engineering, surveying and construction of gas facilities