| World Lightning Protections Co., Ltd. |
| Osaka Lightning Rod Industry Co., Ltd. |
| murata denki Co., Ltd. |
| Negurosu Denko Co., Ltd. |
| Kanafuji Denko Co., Ltd. |
| Furukawa Battery Co., Ltd. |
| Sotoyama Electric Co., Ltd. |
| Densei Kogyo Co., Ltd. |
| Sankei manufacturing Co., Ltd. |
| Maruichi Steel Tube Co., Ltd. |
| Yamazaki Matex Co., Ltd. |
| Nitto Kogyo Co., Ltd. |
| Kawamura Electric Inc. |
| Tempearl Industrial Co., Ltd. |
| Japan Insulation Co., Ltd. |
| Fuji Terminal Industry Co., Ltd. |
| KFC Ltd. |
| Hokuden Co., Ltd. |
| Air Conditioning Co., Ltd. |
| Sunrec Co., Ltd. |
| Koyo Electric Industrial Co., Ltd. |
| Shoichi Metal Co., Ltd. |
| PiCa Corp. |
| Hasegawa Kogyo Co., Ltd. |
| Furukawa Electric Power Systems Co., Ltd. |
| Sanwa tekki corporation |
| TDM Co., Ltd. |
| Sekisui Chemical Co., Ltd. |
| Yashima Denko Co., Ltd. |
| Fujitsu Insulator Co., Ltd. |
| Kowa Kogyo Co., Ltd. |
| Fuji Globe Co., Ltd. |
| Showa Glove Co., Ltd. |
| Sumiden HST Cable Co., Ltd. |
| Kitanihon Electric Cable Co., Ltd. |
| Showa Furukawa Cable Co., Ltd. |
