Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1976-01-08
1977-08-09
Lucas, Susan J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
D1006, D1303
Patent
active
D02453258
REFERENCES:
patent: D190148 (1961-04-01), Reuben
patent: 2851680 (1958-09-01), Cavera
patent: 3017849 (1962-01-01), Grossenheider
patent: 3028830 (1962-04-01), Grundmann
Lucas Susan J.
Whann R. Welton
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