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G stang
Assuming you're talking about the anatomical feature formally referred to as a "navel" ... nobody "invented" them; they've been around for as long as placental mammals have.
No, TV had not yet been invented!!
== == There have been diapers since ancient times. The "cloth diaper" wasn't invented till the 1820's.
It is hard to say when the cowbell was first invented. Some of the first versions have been found dating back to as early as the iron age.