Links
- NHK SPRING CO., LTD.
- https://www.nhkspg.co.jp/eng/
- PIOLAX, INC.
- https://www.piolax.co.jp/en/
- Chuo Spring Co., Ltd.
- http://www.chkk.co.jp/english.html
- TOGO SEISAKUSYO CORPORATION
- http://www.togoh.co.jp/english/index.php
- Sumitomo Electric Industries, Ltd.
- https://global-sei.com/
- Nippon Steel SG Wire Co., Ltd.
- https://www.sgw.nipponsteel.com
- Nippon Seisen Co., Ltd.
- http://www.n-seisen.co.jp/en/
- Shinko Wire Company, Ltd.
- http://www.shinko-wire.co.jp/english/index.html
- SUGITA WIRE, LTD.
- http://www.sugitawire.co.jp
- NIPPON STEEL CORPORATION
- https://www.nipponsteel.com/en/
- Akiyama seiko Co.,Ltd
- http://www.ask-akiyama.co.jp/en/index.html
- Japan Society of Spring Engineers
- http://www.jsse-web.jp/english/index.html
- Japanese Standards Association
- https://www.jsa.or.jp/en/
• Spring manufacturer
• Material manufacturer
• Others