Smith and Wesson patented the first metal bullet cartridges.
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An atomic bomb explosion was aired on TV for the first time.
Machine guns were used for the first time in a battle in Omdurman, Sudan, Africa.
The US started plans to construct its first nuclear battlefield weapon.
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
