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A magnetic core extractor was a device used to remove the effects of anti-magnet cohesion. (TV: Carnival of Monsters)
The Third Doctor used a magnetic core extractor (PROSE: Doctor Who and the Carnival of Monsters) to open the plates on the S.S. Bernice.
Jo used a magnetic core extractor (TV: Carnival of Monsters) to open the plates on the S.S. Bernice.