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Everything YOU need to know about the fallout shelter signs:
A Kennedy administration program to have public shelters
The sign was designed in 1961
The cold war ended in 1991, though the shelters had not been stocked at that point for years
There was no government program for sign removal, leaving us legacy signs
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source:
http://knol.google.com/k/bill-geerhart/an-indelible-cold-war-symbol/1uefuvb7s5ifz/12#