If your character invents the world's first eggbeater, it could well be science fiction. (Hell, the hero in Pohl and Kornbluth's "Mute, Inglorious Tam" invents nothing, and doesn't even have to words to describe the wonders he daydreams of, and that story's pretty generally seen as SF.) Much depends on how you view the character and the invention, and the tone you use. The story could be straight biography, slapstick comedy, tragic quest, whatever.
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