Measuring – testing – or signalling instruments – Security or signal instrument or casing – Element or attachment
Patent
1981-02-17
1983-10-25
Lucas, Susan J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Element or attachment
D10106, D1005
Patent
active
D02710897
REFERENCES:
patent: D213028 (1968-12-01), Walz
patent: 2419957 (1947-05-01), Laford
patent: 2446217 (1948-08-01), Druffel
Nutone Electrical Products Division Catalog, 12-1979, p. 39, Smoke Detector S-230.
Isotec Industries Limited
Lucas Susan J.
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