So... is Kiteretsu Daihyakka finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Kiteretsu Daihyakka follows the adventures of Kiteretsu, a bright young boy with an extraordinary knack for inventing. He creates a robot companion named Korosuke, who becomes his loyal friend and partner in crime.
The series revolves around Kiteretsu using his inventions, most notably a time machine, to travel to different eras and experience history firsthand with his friends.
Alongside Kiteretsu and Korosuke are Miyoko, a kind girl who's Kiteretsu's close friend, and the mischievous duo of Tongari, a boastful rival, and Buta Gorilla, a neighborhood bully who enjoys teasing Korosuke. Each episode promises imaginative journeys and humorous interactions as they navigate various situations brought about by Kiteretsu's inventions.