A deactivatable EAS tag in which a circuit comprising a non-linear element causes the generation of a detectable signal in response to an interrogating signal and in which a first magnetic element is arranged to be brought from a first position where the magnetic element does not short the non-linear...http://www.google.de/patents/US5608379?utm_source=gb-gplus-sharePatent US5608379 - Deactivatable EAS tag
