Photoelectric smoke detector

Details Photoelectric smoke detector Photoelectric smoke detector

1983-08-22

1985-07-30

Bullock, B. J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D02798727

REFERENCES:
patent: D215040 (1969-08-01), Abe
patent: D220662 (1971-05-01), Buhrer
patent: D276417 (1984-11-01), Fenne
Pyrotronics, 7/1975, front page, Fire Detector, upper top of page.

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