How many movies have Edwin B. Willis and Groucho Marx collaborated on?

They have worked on 4 movies together! Their first movie together was A Day at the Races (1937) and was their highest rated movie together. They have not worked together since The Big Store (1941). They are most known for their comedy films together.

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S. Quentin Quale
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Attorney J. Cheever Loophole
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Dr. Hugo Z. Hackenbush