The United States and Russia signed the Moscow Treaty, agreeing to limit their nuclear arsenals.
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The Soviet Union started mass producing the AK-47 assault rifle.
The first private research atomic reactor opened in Chicago, Illinois, US.
Albert Einstein warned against hydrogen bombs on the ''Today with Mrs. Roosevelt" weekly TV show.
Samuel Colt patented the multi-shot revolving cylinder gun.
British Prime Minister Winston Churchill went public that Britain had its first atomic bomb and planned to test it in Australia by the end of the year.
