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Keywords from Image Description:
Pulkoworefraktor. en the Big Refractor of the astronomical observatory in Pulkowo built by Repsold Shne in Hamburg de Der Groe Refraktor des Astronomischen Observatoriums Pulkowo hergestellt von Repsold Shne in Hamburg own Schrajo Aus Repsold Zur Geschichte der astronomischen Mewerkzeuge Bd Leipzig Historical astronomical instruments