Portable door alarm

Details Portable door alarm Portable door alarm

1979-06-25

1981-09-15

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D1005

Patent

active

D02607417

REFERENCES:
patent: D240410 (1976-07-01), Fujiwara
patent: 3643249 (1972-02-01), Haywood
patent: 3732843 (1973-05-01), Pappas et al.
patent: 3878539 (1975-04-01), Gooding
Hardware Age, 8-1975, p. 174-Burglar/Fire Alarm.

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