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George Koval smuggles secrets about the atomic bomb back to the USSR (10 h 46 min, 14 nov 1948 ans – 13 h 25 min, 18 mars 1949 ans)

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10 h 46 min, 14 nov 1948 ans

13 h 25 min, 18 mars 1949 ans

~ 4 months and 3 days

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