The following is a timeline of key events related to<unk><unk> : Date Event 1908 Nichitsu opens a chemical factory in<unk>  1932 Acetaldehyde production using a mercury catalyst begins 1945 Japan is defeated in World War II. The Allied occupying forces order the dismissal of Nichitsu 1950 Shin Nichitsu is founded as the successor to the old company August 1951 The co-catalysed was changed from manganese dioxide to ferric sulfide resulting in side production of methylmercury 1956 1 May Company hospital director Hajime Hosokawa reports the discovery of<unk><unk>  24 August Kumamoto University research group formed 4 November Kumamoto University research group reports initial suspicion of a heavy metal poisoning, presumably through eating contaminated fish 1958 March British neurologist Douglas McAlpine suggests that<unk><unk>  symptoms resemble those of organic mercury poisoning September Shin Nichitsu changes the acetaldehyde plant wastewater discharge route from<unk>  Bay to<unk>  River 1959 February Investigations of<unk>  Bay uncover shocking mercury contamination 29 August Mediated compensation agreement between Chisso and the<unk>  Fishing Cooperative for damage to fishing 21 October Shin Nichitsu changes the acetaldehyde plant wastewater discharge route back from<unk>  River to<unk>  Bay 2 November Members of the Kumamoto Prefectural Alliance of Fishing Cooperatives invade the<unk>  factory and riot, causing damage amounting to JPY10 million 12 November The Ministry of Health and Welfare reports that<unk><unk>  is a poisoning<unk> ... caused by the consumption of large quantities of fish and shellfish living in<unk>  Bay and its surroundings, the major causative agent being some sort of organic mercury compound." 17 December Mediated compensation agreement between Chisso and the Kumamoto Prefectural Alliance of Fishing Cooperatives for damage to fishing 29 December Mediated compensation agreement between Chisso and the<unk><unk>  Patients Families Mutual Aid Society 29 November 1962 18 children are certified as the first congenital<unk><unk>  victims 1965 1 January Shin Nichitsu changes its name to the Chisso Corporation 12 June The outbreak of a second<unk><unk>  in Niigata Prefecture is made public 1968 March Niigata patients file a lawsuit against Showa Denko 26 September The national government issues an official conclusion as to the cause of<unk><unk>  and Niigata<unk><unk>  1969 14 June Litigation Group of the Mutual Aid Society files a lawsuit against Chisso in the Kumamoto District Court 1970 4 July Hajime Hosokawa testifies from his deathbed about his cat experiments in the Litigation Group trial 27 May Arbitrated compensation agreement between Chisso and the Arbitration Group of the Mutual Aid Society 1971 29 September Showa Denko found guilty of negligence; Niigata patients win compensation 1972 1973 20 March Chisso found guilty of negligence; Litigation Group patients win compensation 1977 A net is installed around<unk>  Bay to prevent toxic sludge and fish from contaminating other areas 1 September 1997 The net surrounding<unk>  Bay is removed and fish caught there are declared safe to eat 15 October 2004 The Supreme Court of Japan rules that the national government was responsible for not preventing the spread of<unk><unk>  after 1960
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