| Mar. 1925 |
Former Chairman Shigeru Omori founded Yamakyu Hanbaibu in Tokyo |
| Sep. 1931 |
Established Osaka sales office |
| Sep. 1939 |
Stock coporated with capital of JP YEN 180,000 |
| Apr. 1948 |
Established Nagoya sales office |
| Apr. 1950 |
Re-named Yamakyu Chain Co.,Ltd. |
| Apr. 1952 |
Established Kyushu sales office |
| Apr. 1953 |
Established Hiroshima sales office |
| Oct. 1960 |
Established Yamakyu Kousan(Currently Yamakyu Automatics Co.,Ltd.) |
| Apr. 1962 |
Established Yamakyu Seisakusho (Former Ageo Plant) |
| Apr. 1965 |
Merged Yamakyu Seisakusho |
| Mar. 1973 |
Head Office moved to Tokyo Takanawa |
| Aug. 1974 |
Plant moved to Kuki,Saitama |
| Dec. 1977 |
Established Manifold Yamakyu Ltd. |
| Feb. 1984 |
Established Autogard Japan Ltd. |
| Jul. 2001 |
Merged Manifold Yamakyu Ltd. |
| Nov. 2003 |
Acquired 100% Share of Autogard Japan Ltd. |
| Apr. 2006 |
Became consolidated subsidiary company of Tsubakimoto Chain Co. |
| May. 2006 |
Re-named to Tsubaki Yamakyu Chain Co. |
| Apr. 2012 |
Re-structured chain business |
| Mar. 2013 |
Completed new building in Kuki Plant |
