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George Koval smuggles secrets about the atomic bomb back to the USSR (10 ч 46 мин, 14 ноя 1948 г. – 13 ч 25 мин, 18 март 1949 г.)

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10 ч 46 мин, 14 ноя 1948 г.

13 ч 25 мин, 18 март 1949 г.

~ 4 months and 3 days

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