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Electromagnetic compatibility
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=== Early twentieth century === It may be said that radio interference and its correction arose with the first spark-gap experiment of [[Guglielmo Marconi|Marconi]] in the late 1800s.<ref name=":0">{{Cite book|title=Introduction to electromagnetic compatibility|last=Clayton|first=Paul|publisher=Wiley|year=2008|isbn=978-81-265-2875-2|pages=10}}</ref> As [[Radio|radio communications]] developed in the first half of the 20th century, interference between [[broadcast]] radio signals began to occur and an international regulatory framework was set up to ensure interference-free communications. Switching devices became commonplace through the middle of the 20th century, typically in petrol powered cars and motorcycles but also in domestic appliances such as thermostats and refrigerators. This caused transient interference with domestic radio and (after World War II) TV reception, and in due course laws were passed requiring the suppression of such interference sources. ESD problems first arose with accidental [[electric spark]] discharges in hazardous environments such as coal mines and when refuelling aircraft or motor cars. Safe working practices had to be developed.
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