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History
| 1883 | Manufacturing and sales of the file are managed by the Kajiyama family |
|---|---|
| 1928 Mar | Kajiyama three brothers formed a partnership with capital of 50 thousand JPY. he file manufactory of Tsubosa was established and the president is KIzuichi Kajiyama. |
| 1954 Nov | The factory reorganised to be limited company. The second generation of president is Tadashi Kajiyama. |
| 1957 Oct. | The capital was increased by 25 million JPY. |
| 1961 May. | Chugoku Steel Manufacture Ltd. was renamed. |
| 1961 Oct. | As the merging with Kobe Steel Manufactory and investment from Shinko Shoji Business Ltd., the capital was increased by 70 million JPY. |
| 1964 Dec. | The smelting department was seperated from Chugoku Steel Manufacture Ltd. and formed Tsubosa Smelting Ltd. with capital of 20 million JPY. |
| 1971 Nov. | The capital was increased by 45 million JPY. |
| 1972 Aug. | The new factory was established in Kure Industrial Area. The site area is about 9650 square metres, and the building area is about 7655 square metres. |
| 1974 Mar. | The capital was increased by 50 million JPY. |
| 1975 Jan. | The capital was increased by 60 million JPY. |
| 1985 Jun. | The capital was increased by 70 million JPY. |
| 1992 Mar. | The company renamed as Tsubosa Ltd. |