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20-Fuß Refraktor von Herschel Herschel 20 Fuß Refraktor https://www.astronomische-gesellschaft.de/en/working-groups/history-of-astronomy/PIFICONS/Herschel-20-Fuss/view https://www.astronomische-gesellschaft.de/en/working-groups/history-of-astronomy/PIFICONS/Herschel-20-Fuss/@@download/image/William_Herschel's_Twenty-Foot_Reflecting_Telescope_HIN430-Wikipedia.jpg

20-Fuß Refraktor von Herschel

Herschel 20 Fuß Refraktor

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