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Potsdam Great Refractor

historic astronomical telescope in an observatory in Potsdam, Germany

en-US/ˈpɑtsˌdæm ˈɡɹeɪt ɹɪˈfɹæktɚ/
en-GB/ˈpɒtsdæm ˈɡɹeɪt ɹɪˈfɹæktə/

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double telescoperefracting telescopebuilding