Stock Photo - 14 July 2021, Thuringia, Ruhla: Artur Kamp (r) and Matthias Böhm (l) talk to each other next to the original of the caesium atomic clock built in the GDR in the Ruhla Clock Museum. On 15 July, a special exhibition on the subject of ""Time"" opens in the museum. In addition to the GDR's secret atomic clock, other clocks, some of them historical, and a photo exhibition will be on display. Photo: Martin Schutt/dpa-Zentralbild/dpa. - Ruhla/Thuringia/Germany

Stock Photo: 14 July 2021, Thuringia, Ruhla: Artur Kamp (r) and Matthias Böhm (l) talk to each other next to the original of the caesium atomic clock built in the GDR in the.

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