1975 When first sattelite launched

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1975 When first sattelite launched
Russia in 1976
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1983 By russia
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Bernaullie by switzerland
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Subramanayan chandershekhar
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International mathematics congress 1998
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International year of mathematics 2000
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International congress of mathematics 2006
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COLLECTION BY SAWYAM GUPTA CLASS- XA J.N.V.
BATHINDA