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- Affiliated Companies
Tokyo Warehouse Jitsugyo Co., Ltd.

| Founded | May 1974 |
|---|---|
| Capital | 35 million yen |
| Address | 9-3-2 Higashi-Kasai, Edogawa-ku, Tokyo |
| Business Activities | General warehousing, automobile transportation, and handling of hazardous materials warehousing |
N. R. Trading Co., Ltd.

| Founded | August 1984 |
|---|---|
| Capital | 10 million yen |
| Address | 9-3-5 Higashi-Kasai, Edogawa-ku, Tokyo |
| Business Activities | Operation of the super sentō (public bathhouse) Yudokoro Kasai |
Koike Seiki Co., Ltd.

| Founded | December 1983 (Showa 58) |
|---|---|
| Capital | 10 million yen |
| Address (Headquarters) | 9-3-1 Higashi-Kasai, Edogawa-ku, Tokyo |
| Address (Katori Factory) | 809-2 Ichiya, Katori City, Chiba Prefecture |
| Business Activities | General machining, general welding and manufacturing of steel structures |
N.R. Engineering Co., Ltd.
| Founded | May 1998 |
|---|---|
| Capital | 30 million yen |
| Address | 9-3-2 Higashi-Kasai, Edogawa-ku, Tokyo |
| Business Activities | Machinery repair services |
