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00206_Text_206.txt
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1999-06-04
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1955 November 22- First fusion device test by the Soviet Union, it had a yield of
1.6 megatons. The development was lead by Andrei Sakharov.
1957 May 15-First British H-bomb exploded at Christmas Island.
September 19-First underground test, Rainier, 1.7 kilotons.
1958 November, 1958 to September, 1961-U.S., U.K., and U.S.S.R. observe an
informal moratorium on nuclear tests.