Room security device

Details Room security device Room security device

1978-07-07

1981-04-07

Stallard, W.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D10116, D1005

Patent

active

D02588072

REFERENCES:
patent: D222897 (1972-01-01), White
patent: D231134 (1974-04-01), Doodson
Funkschau 1977, vol. 1, pp. 27-30.

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