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http://www.google.co.uk/patents/US3660831?utm_source=gb-gplus-share
Patent US3660831 - ELECTRONIC ANTITHEFT DEVICE USING AN ELECTRONIC SAFETY LOCK
ELECTRONIC ANTITHEFT DEVICE USING AN ELECTRONIC SAFETY LOCK
Maurilio Nicola; Ezio Luciano et al
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Abstract
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Description
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Patent number
: 3660831
Filing date
: 2 Apr 1970
Issue date
: 1972
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