As early as 1956, Catsch was at the Biophysikalische Abteilung des Heiligenberg-Instituts, in Heiligenberg, Baden, Germany.
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What happened to Catsch after the Russians entered Berlin at the close of World War II is best understood in the context of his colleagues Karl Zimmer and Hans-Joachim Born at the KWIH, who had a close professional relationship with Nikolaus Riehl, the scientific director of the Auergesellschaft, in Berlin.
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