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Liebmann, Rob. (Robert)
found: His The blue angel, 1968.
found: The blue angel, c1986: credits (Robert Liebmann)
found: Internet movie database, Dec. 17, 2004 (Robert Liebmann; b. 1890, Berlin, Germany; screenwriter, 1910s-1950s)
found: Lied der Kaiserin, 1933 (Rob. Liebmann)