How many movies have Hans Schumm and Rudolf Steinboeck collaborated on?

They have worked on 4 movies together! Their first movie together was Confessions of a Nazi Spy (1939) while their highest rated movie together was Once Upon a Honeymoon (1942). They have not worked together since Mission to Moscow (1943). They are most known for their drama films together.

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Train Gate Guard (uncredited)
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German (uncredited)
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Warsaw Gestapo Agent (uncredited)
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Party Guest (uncredited)
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Bismarck Officer with Crew List (uncredited)
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(uncredited)