- Itoh Kikoh Co., Ltd.
- Address:
- TOHOKU SHARYO MANUFACTURING.,LTD
- Address:3-3-18, Kamiaokinishi,
- CHUBU SANGYO CO., LTD.
- Address:2-9-13, Hataya, Atsuta-ku
- Okudaya Giken Co.,Ltd. (ORIGINAL OPK BRAND)
- Address:No. 285 Tanjo, Mihara-ku Osaka, Japan
- Kaito Co., Ltd.
- Address:4-4-8 Sasage Konan-ku
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