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History
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A caesium atomic fountain used as part of an atomic clock
A caesium atomic fountain used as part of an atomic clock
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NPL's main entrance on Hampton Road
NPL's main entrance on Hampton Road
The Electricity Division of the National Physical Laboratory in 1944
The Electricity Division of the National Physical Laboratory in 1944
Robert Watson-Watt
Robert Watson-Watt
Louis Essen at right, with Jack Perry
Louis Essen at right, with Jack Perry