Sentry Telecom Systems Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6574321 Apparatus and method for management of policies on the usage of telecommunications servicesExpiredApr 02, 99Jun 03, 03[H04M]
5353346 Multi-frequency signal detector and classifierExpiredDec 22, 92Oct 04, 94[H04M]

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