Light activated intrusion alarm

Details Light activated intrusion alarm Light activated intrusion alarm

1988-04-29

1991-01-29

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03141608

REFERENCES:
patent: D277652 (1985-02-01), Kahl, Jr. et al.
patent: D303223 (1989-09-01), Issa
patent: 4438428 (1984-03-01), Ober et al.

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