Yoshiwa Kogyo |
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Documents |
| Date | Document Name & Details | Documents |
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| 28 December 1976 | Method of Surface Hardening United States Patent US 4,000,011 Nobuaki Sato and Katsuro Yamasaki for Toyo Kogyo Co., Ltd. and Yoshiwa Kogyo Kabushiki Kaisha |  PDF - 2.3MB - 5 pages |