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Tholme Higher quality from http://www.npl.co.uk/upload/img/essen-experiment_1.jpg
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Coenen {{Information |Description={{en|1=Louis Essen standing next to the world's first atomic clock (1955)}} |Source=http://www.npl.co.uk/upload/img_400/atomic_clock.jpg |Author=National Physical Laboratory |Date=1955 |Permission= |other_versions= }} == Licensi
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