Security system

Details Security system Security system

1980-03-05

1982-06-01

Pitts, Harold I.

Communications: electrical

Continuously variable indicating

With meter reading

340543, 34082536, H04Q 300

Patent

active

043330746

ABSTRACT:
A security system in which a predetermined combination can be set by a operator to disable the system. An audible alarm is sounded when the entered combination differs from the correct combination by an error outside prescribed limits and a secondary alarm given when the error is within the limits.

REFERENCES:
patent: 3633167 (1972-01-01), Hedin
patent: 3878511 (1975-04-01), Wagner
patent: 3881171 (1975-04-01), Moorman
patent: 3881171 (1975-04-01), Moorman
patent: 3953769 (1976-04-01), Sopko
patent: 4021796 (1977-05-01), Fawcett
patent: 4095239 (1978-06-01), Gerry

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