Electronic security device

Details Electronic security device Electronic security device

1981-06-30

1983-08-02

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

235382, H04Q 900

Patent

active

043969143

ABSTRACT:
An electronic security device includes a memory and a card reader which reads a combination code and calculation data from a key card. An electronic circuit compares the content of the memory with the combination code and enables the lock device if a match is found. If the key card is a new one the circuit calculates a new combination code by applying the calculation data to the memory content and, if this new combination code matches that on the key card the memory is loaded with the new combination code.

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