http://pastport.jp/user/steelseiko ja-JP Shandong Speed Steel Seiko Factory Co., Ltd. relies on the belief of striving for exquisite processing in the industry, establishes the spirit of enterprise excellence, dares to innovate.https://www.steelseiko.com/ 2023-02-10T14:46:16+0900 http://pastport.jp/user/steelseiko/timeline/Shandong%20Speed%20Steel%20Seiko%20Factory%20Co.%2C%20Ltd. steelseiko http://pastport.jp/user/steelseiko/timeline/Shandong%20Speed%20Steel%20Seiko%20Factory%20Co.%2C%20Ltd.