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Wikipedia definition
1. DepermingDeperming, or degaussing, is a procedure for erasing the permanent magnetism from ships and submarines to camouflage them against magnetic detection vessels and enemy marine mines. A sea-going metal-hulled ship or submarine, by its very nature, develops a magnetic signature as it travels due to a magneto-mechanical interaction with the Earth's magnetic field.
Read “Deperming” on English Wikipedia
Read “船体消磁” on Japanese Wikipedia
Read “Deperming” on DBpedia

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