Question: When were the first atomic clocks built? Select one: a . 1 9 7 0 s b . 1 9 5 0 s c .

When were the first atomic clocks built?
Select one:
a.1970 s
b.1950 s
c.1940 s
d.1920 s
Clear my choice
When were the first atomic clocks built? Select

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