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| Keywords: BirdQuadrant.jpg Mauerquadrant von Bird ca 1770 Mural Quadrant by Bird c 1770 Geschichte der Astron Messwerkzeuge 1907 J A Repsold 1919 PD-old Check categories 2008 November 7 en wikipedia Mannheim_Observatory de wikipedia Mannheimer_Sternwarte Mannheim Deutschland Sternwarte Mannheim Science and technology in Germany | ||||
