Intrusion alarm for doors

Details Intrusion alarm for doors Intrusion alarm for doors

1990-10-04

1992-11-10

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03308669

REFERENCES:
patent: D305508 (1990-01-01), Lothamer
patent: D307875 (1990-05-01), Mallory
patent: 4553134 (1985-11-01), Holt
patent: 4758824 (1988-07-01), Young
patent: 4929926 (1990-05-01), Porat

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