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Keywords from Image Description:
Repeating circle. en repeating circle in display cabinet in Argelander hall in Helsinki observatory Made by Utzschneider und Fraunhofer in fi Repetitioympyr Helsingin observatoriossa Argelandersalin nyttelykaapissa Utzschneider und Fraunhoferin vuonna valmistama own MKFI Collections of the Helsinki Observatory Reflecting circles