Alarm combination lock

Details Alarm combination lock Alarm combination lock

1979-03-22

1981-07-07

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340149R, 340543, G05B 100

Patent

active

042777771

ABSTRACT:
This invention relates to safety and security systems. Selective analog solid state electronics which permit entry to or exit from a secured area for authorized personal by a sequential push button operation or by coded card reading.

REFERENCES:
patent: 3764982 (1973-10-01), Kidnocker
patent: 3781804 (1973-12-01), Lederer
patent: 4152696 (1979-05-01), Smith

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