Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
Patent
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.
Powers Robert B.
Thornton, Jr. Hugh P.
American District Telegraph Company
Bullock B. J.
Gitlin Suzanne N.
Grover James H.
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