Smoke detector

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof

Patent

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Details

D10121, D1005

Patent

active

D02568977

REFERENCES:
patent: D213028 (1968-12-01), Walz
patent: D215974 (1969-11-01), Berns
patent: D242133 (1976-11-01), Fitzsimonds
patent: D244362 (1977-05-01), Mayer

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