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About the Company
HOME > About the Company > History 1920's - 1970's
History 1920's - 1970's 1980's - 2000's
1920's  
Sept. 1920 Hiroichiro Ishihara established in Osaka Nanyo Mining Partnership Co., a firm dedicated to iron mining in Surimedan, Johol on the Malay Peninsula .
May 1924 Purchased an iron and manganese mine in Kemaman, Torenganu on the Malay Peninsula .
Aug. 1929 Renamed the Firm Ishihara Sangyo Marine Partnership.
1930's  
Mar. 1934 Reorganized the Firm into a limited company. Opened Kishu mine (copper and sulfide ores) in Mie Prefecture .
Oct. 1938 Began building Yokkaichi Plant in Mie Prefecture . (Copper refinery and sulfuric acid plants were completed in Jan. 1941.)
1940's  
June 1943 Transferred shipping operations to Nihon Marine Co., Ltd. Renamed the Firm Ishihara Sangyo Kaisha ., Ltd.
June 1949 Dissolved the Firm in compliance with the Industrial Readjustment Law. Restarted operations under the new company: Sanwa Mining & Industrial Co., Ltd. Renamed Ishihara Sangyo Kaisha, Ltd. the same month.
July 1949 Listed Company stock on Tokyo and Osaka Stock Exchanges.
1950's  
Apr. 1950 Constructed herbicide plant in Yokkaichi .
July 1952 Constructed chemical fertilizer plant in Yokkaichi .
Mar. 1954 Constructed sulfate processed titanium dioxide plant in Yokkaichi .
June 1958 In Yokkaichi opened a research institute, which was renamed the Central Research Institute in June 1963.
1960's  
July 1961 Constructed ammonium sulfate plant in Yokkaichi .
Mar. 1963 Constructed titanium yellow (yellow pigment) plant in Yokkaichi .
Apr. 1965 Relocated Central Research Institute to Kusatsu, Shiga Prefecture .
1970's  
Sept. 1970 Completed wastewater treatment facility in Yokkaichi .
June 1971 Constructed synthetic rutile plant in Yokkaichi. (Stopped production in March, 1994.)
Oct. 1974 Constructed chloride processed titanium dioxide plant in Yokkaichi .
Dec. 1974 Constructed a sulfuric acid plant in Yokkaichi that employed the sulfur combustion method.
Jan. 1976 Transferred fertilizer manufacture and marketing business to Ishihara Hiryo Kogyo Co., Ltd. (dissolved February 1990).
May 1978 Closed Kishu Mine.

1980's - 2000's
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