Importance

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Abstract

A magnetic security system is controlled by a magnetic key having magnetic devices defining an operating code which may be operatively interposed relative to a sensing device which will read the code defined on the key and will activate an electrical control system for delivering an electrical signal depending upon the code sensed upon the interposed key. The sensor device includes a code storage element and when the magnetic key is interposed relative to the sensor device, a comparison is drawn between the code on the key and the code programmed into the storage element. The storage element includes means for changing the code which is stored therein and lock means are provided to enable and disable changing of the code stored in the storage element.

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First Claim