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The Eternity Perpetual Company of planet Umbeka created products so longlasting that the company went out of business.

The company produced the everlasting power generators used in miniscopes, (TV: Carnival of Monsters) the Promethean Everlasting Matches used by the Doctor. (PROSE: The Cabinet of Light) and the cosmic radiation batteries used in Super Lucky Romance Cameras. (PROSE: Borrowed Time)