ATOMIC CLOCK
(See also Radioactive Dating)
accuracy: g61 5/22 29
U.S. timekeeping standard:
accuracy: g85 8/8 30
adjustment of clocks: g85 8/8 30
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ATOMIC CLOCK
(See also Radioactive Dating)
accuracy: g61 5/22 29
U.S. timekeeping standard:
accuracy: g85 8/8 30
adjustment of clocks: g85 8/8 30