What was the name of the Disney movie to which Son of Flubber (1963) was a sequel?

The Disney movie Son of Flubber (1963) was a sequel to The Absent-Minded Professor (1961).

Both films starred Fred MacMurray as Professor Ned Brainard. Flubber, or “flying rubber,” was an invention of his.

What was the first feature-length comedy? Tillie' s Punctured Romance (1914), directed by Mack Sennett, was the first feature-length comedy.
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