The true Infinity Gauntlet wasn't introduced until 2015 in Avengers: Age of Ultron's mid-credits scene, where Thanos retrieved the glove and put it on after deciding to search for the Infinity Stones himself after his minions failed to do his bidding.

When did Thanos have the Gauntlet made?

The Gauntlet first appeared as an Easter egg in Odin's hall of treasures on Asgard in Thor. Thanos is then shown retrieving the Infinity Gauntlet from a vault of some kind in the post-credits scene of Avengers: Age of Ultron. In Thor: Ragnarok, Hela declares the Infinity Gauntlet in Odin's vault to be a fake.

Who built Thanos Gauntlet?

The only information given on how the Gauntlet functions is that, due to the flaw intentionally built in by Eitri, one must first clench their fist to use the Gauntlet, after which the Stones activate and glow depending on which one(s) the user is interested in or actively using: whether it is one Stone at a time, one ...