Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
Patent
1988-09-27
1991-08-20
Word, A. Hugo
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Alarm or control thereof
D25 39
Patent
active
D03191958
REFERENCES:
patent: D297221 (1988-08-01), Podhrasky
patent: D307400 (1990-04-01), Armstrong et al.
patent: 3950696 (1976-04-01), Miller et al.
patent: 4274090 (1981-06-01), Cooper
patent: 4384281 (1983-05-01), Cooper
Belletire Steven P.
Gresens Stanley T.
Rubertus Roland W.
Zarembo Peter J.
Barte William B.
Clark Doris
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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