 In the 70s, a short, truncated print was made available for schools, etc.   It skips over the entire first half, only showing scenes in the factory  (except portions of the scene where everyone waits for the gates to open).   It cuts out everything following the "Fizzy Lifting Drinks" scene, and the  only two scenes even near their complete versions are the Fizzy Lifting  Drinks and the Inventing Room