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In page The Wonderful World of the Brothers Grimm:

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The Wonderful World of the Brothers Grimm was produced and exhibited in the original three-panel Cinerama widescreen process. MGM had signed a deal with Cinerama to make four films that attempted to tell a cohesive story, unlike previous productions, which had all been travelogues. How the West Was Won would be the first film and in March 1961 MGM announced Grimm would be the second.[1] (After these two a single-lens Cinerama was used for narrative films.)[2]