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23h 14min, apr 12, 1955 y - the vaccine was released for use in the United States.
Added to timeline:
Chapter 20 The Postwar Years U.S. in the 1950s Timeline
By
baby boomer
15 Dec 2017
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544
Date:
23h 14min, apr 12, 1955 y
Now
~ 70 years ago
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