| April 1917 |
Kikumatsu Nakatsuji founds the Nakatsuji Kikumatsu Shoten, a wholesale business dealing in used machinery and raw materials to the steel industry, in Kitakoyo-cho, Sakai City. |
| April 1952 |
Minoru Nakatsuji inherits the Nakatsuji Kikumatsu Shoten, restructuring it as a corporation. The new corporation is called Nakatsuji Limited, and Minoru Nakatsuji became the CEO.
The company starts selling raw materials for steelmaking and manufacturing hot forged bicycle parts. |
| October 1962 |
The company switches from hot forging to cold forging. |
| December 1971 |
The Tadaoka Plant is established at Tadaoka-cho in Senboku-gun, as a metal recycling and processing plant. |
| November 1978 |
The company is honored by the Sakai Tax Office as an "Exemplary Reporting Company." (This designation has continued to the present day.) |
| December 1979 |
The Senboku-Takasago Plant is built to expand the cold forging line at Takasago in Takaishi City. |
| March 1983 |
A new headquarters building is built at Kitakoyo-cho in Sakai City. |
| May 1985 |
Tsunefumi Nakatsuji becomes the President. |
| March 1988 |
The Machinery Processing Division is established at the Senboku-Takasago Plant to raise the added value of products. |
| January 1993 |
The Tadaoka Plant and its facilities are expanded to create a total metal recycling plant. |
| May 1999 |
The company obtains approval from the Osaka Prefectural Government to operate as a processor of industrial waste (intermediate treatment, crushing). (Permit Number 2720031509) |
| June 1999 |
The Senboku-Takasago Plant obtains ISO 9002 Quality Management System certification from U.L. Japan. (File Number A7953) |