Magnetic core extractor

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 magenetic 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.