- CHUO KOZAI.CO.,LTD
- Address:4-8-2 hacchobori, chuo-ku
- KITANI Corporation
- Address:12-10 Nakayoshida Suruga
- IDASYOUTEN INC
- Address:2-6-19, Ooimazatominami, Higashinari-ku
- YAMAICHI SPECIAL STEEL CO.,LTD
- Address:2-146, Oneyama, Midori-ku,
- Tetsusho Kayaba Corporation
- Address:chuo, tokyo, Japan
- Osaka Heat-Treatment Co., Ltd.
- Address:3-49, Tsuto Iiden Cho
- TOHOKU OKAJIMA KOGYO CO.,LTD.
- Address:1-1-9, Matsusakadaira, Taiwacho,
- Eco Japan Corporation
- Address:360-36 Minato-cho
- benxi steel
- Address:24 Woon
- GOTO professional coil Co.,Ltd
- Address:734-1, Shibahashi
- TOSTE CO., LTD.
- Address:2-1-32, Honden
- QH STEEL JAPAN.Co.,Ltd
- Address:403, 2-14, Honmachibashi, Chouku