Principal business partners
＜Domestic＞
- Iwase Prince Electric Co., Ltd.
- Osaka Gas Co., Ltd.
- Osaka Sohchi Kensetsu Co., Ltd.
- OM Industry Co., Ltd.
- KUBOTA Corporation
- Sunray Reinetsu Co., Ltd.
- Suntory Spirits Ltd.
- SHIZUOKA GAS CO.,LTD.
- SHOFU INC.
- Suiko Co., Ltd.
- Stanley Electric Co., Ltd.
- GS Yuasa Corporation
- CKD Corporation
- SHOEI MFG. CO., LTD.
- DAIGAS ENERGY CO.,LTD
- Daigas G&P Solution CO.,LTD
- Chugai Ro Co., Ltd.
- TOHO GAS Co., Ltd.
- TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
- NIPRO CORPORATION
- NIDEC MACHINE TOOL CORPORATION
- NICHIDEN-RIKA GLASS CO.,LTD.
- NHON GAS ENGINEERING CO.,LTD
- General Building Research Corporation of Japan
- NIPPON CRUCIBLE CO.,LTD
- Panasonic Corporation
- Panasonic Electric Works Co., Ltd.
- Panasonic Industry Co., Ltd.
- Panasonic Energy Co., Ltd.
- Panasonic Lighting Devices Co., Ltd.
- HIRAKAWA CORPORATION
- Hitachi, Ltd.
- HIROSHIMA GAS Co.,Ltd
- FUJI SEISAKUSYO Co.,LTD
- FUKUDA METAL FOIL & POWDER CO., LTD.
- Futamura Chemical Co., Ltd.
- HotaluX, Ltd.
- VOLCANO Co.,Ltd
- Mitsubishi Electric Corporation
- Murase Ro Kogyo K.K.
＜Overseas＞
- OSRAM (Germany, Italy, Mexico, Brazil)
- OSRAM SYLVANIA (USA, Canada)
- SLI (Germany)
- SCHUNK GmbH & Co. KG (Germany)
- Manufacturers in South Korea
- Manufacturers in Taiwan