| Apr 1959 | Hatsoo Nakai established as Kaga Parts, an auto parts store, in Fukushima-ku, Osaka. |
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| Sep 1962 | “Reorganized Kaga Parts and established Kaga Shokai Ltd. in Kushincho, Kita-ku, Osaka. (Capital: 3.5 million yen) Established Kaga Shokai Co.” |
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| Apr 1963 | Built a new office building in Genpachihashi, Kita-ku, Osaka and opened a store specializing in the manufacture and sale of duplicate keys. |
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| Jan 1969 | Opened Fukuoka Branch in Hie, Hakata-ku, Fukuoka City. |
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| Dec 1971 | Kaga Shokai Ltd. was spun off and Kaga Corporation was established as a separate company with a capital of 5 million yen. |
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| Jul 1974 | Began production and sales of decorative duplicate keys (fashion keys). |
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| Nov 1975 | Increased capital of Kaga Corporation to 15 million yen. |
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| Mar 1977 | Kaga Corporation changed its name to Clover Corporation, the same name as its product name. The head office was relocated to Minamimorimachi, Kita-ku, Osaka. |
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| Dec 1977 | Toyonaka Factory established in Toyonaka City, Osaka. |
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| May 1978 | New head office building completed and relocated to Higashimikuni, Yodogawa-ku, Osaka. |
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| Dec 1980 | Moved Fukuoka Branch to Sanno, Hakata-ku for a larger office. |
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| Jan 1981 | Established Tokyo Sales Office in Toshima-ku, Tokyo. |
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| Apr 1983 | Joined the Japan DIY Association. |
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| Sep 1986 | Manufacturing plant completed in Haradanaka, Toyonaka, Osaka (Toyonaka plant relocated). |
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| Oct 1986 | Increased capital to 20 million yen. |
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| Dec 1986 | Started manufacturing and sales of Camlock series (cylinder locks). |
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| Apr 1987 | Started sales of mechanical keyless locks. |
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| Nov 1988 | Camlock series received the Invention Encouragement Award from the Japan Institute of Invention and Innovation. |
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| Sep 1992 | Moved head office to the same location of its manufacturing plant (Toyonaka-city). |
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| Mar 1993 | Began production and sales of key cutting machines. |
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| Apr 1996 | Started import and sales as a distributor of Silica S.p.A. in Italy. |
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| May 1997 | Joined ALOA Japan Chapter. |
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| Oct 1997 | Joined Japan Lock Industry Association. |
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| Nov. 2002 | Joined the Osaka Prefecture Lock Technician Security Cooperation Association. |
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| Mar. 2006 | Clover Kyushu Ltd. was incorporated as a separate company. |
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| Sep. 2011 | Established a subsidiary company, Cleat Corporation, in Higashimikuni, Yodogawa-ku, Osaka. |
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| Nov. 2015 | Clover Kyushu Ltd. was made a subsidiary of Clover Corporation. |
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