Japanese
| 1923 | Arimitsu Seisakusho founded by Yukishige Arimitsu
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| 1928 | Developed Japan's first Triplex plunger pump.
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| 1935 | Constructed new factory in 1-13, Fukaenaka, Higashinari-ku, Osaka City. |
| 1941 | Constructed new factory in 1-16, Fukaenaka, Higashinari-ku, Osaka City.
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| 1945 | Changed name to Arimitsu Agricultural Machinery Co., Ltd.
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| 1961 | Developed pressure washer for brewing barrels.
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| 1966 | Nagano Office opened in Matsumoto City. |
| 1968 | Opened Kanto sales Office in Omiya City. |
| 1969 | Acquired 20,456m2 site in Tawaramotocho for Nara Factory. |
| 1970 | Changed name to Arimitsu Industry Co., Ltd. Its name changed to "Arimitsu Industry Co., Ltd.", active in the field both in name and in reality a variety of the "Arimitsu". |
| 1971 | Opened Tokyo Office. |
| 1973 | Completed factory in 2-Chome Fukaekita, Higashinari-ku, Osaka City. |
| 1975 | Completed 1st stage of Nara Factory. |
| 1987 | Yukinori Arimitsu is appointed President. |
| 1990 | New Head Office building built at the present location in 1- Chome Fukaekita, Higashinari-ku, Osaka City. |
| 1991 | New Kanto Office completed in Omiya City. |
| 1994 | Completed new Hokkaido Office in Sapporo. |
| 1995 | Extended Nara Factory.
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| 1997 | Completed new Kyushu Sales Office in Ohnojo City. |
| 1998 | Integrated Manufacturing Division into Nara Factor. |
| 1999 | Acquired ISO9001 (Nara Factory, Osaka Center). |
| 2002 | Acquired ISO14001 (Nara Factory, Osaka Center). |
| 2005 | Transferred Nagoya Sales Office to 1-3, Atsuta-ku. Commenced sales of electrostatic nozzle(Statical Fog)AES-01,AES-02.
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| 2008 | Released cart-type electrostatic nozzle (Statical Fog) AES-10NT. |
| 2009 | Developed & released "Hiyayakko" (ACJ type). Developed & released "Karu-ra 3ch radio-control sprayer" (ATC-1066KAR). Developed & released Power Duster for Ride Type Rice Planting Machine(ASG-7060). |
| 2011 | Developed & released fog system for air-conditioning.
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Arimitsu Seisakusho founded by Yukishige Arimitsu in Awaza, Nishi-ku, Osaka City. Commenced production and marketing of circulatory rice polishing machine equipment, irrigation pumps, fire fighting pumps.
Utilized by fruit farmers for pest control, and to car wash and train wash.
Commenced manufacturing military equipment, fire fighting pumps. Established Arimitsu Military Supplies Co., Ltd. Newest Fukaenaka factory lost due to war damage. Changed name to Arimitsu Agricultural Machinery Co., Ltd. Due to the end of war. Restart production of circulatory rice polishers, hand dusters, power sprayers.
Developed pressure washer for brewing barrels. Began expansion into industrial field.
