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Controlled Access Line Integrity Disclosure Number: IPCOM000069682D
Original Publication Date: 1978-Jun-01
Included in the Prior Art Database: 2005-Feb-21

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Related People

Dillon, BC [+details]


A digital test is provided to determine existence of an "open door" or "open line" in a controlled access system. Such a system may use a magnetic stripe card or badge reader at each door to control access into a building or other secured area. In a typical system, the reader requires a four wire hook-up system.