Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1991-01-28
1992-08-25
Burke, Wallace R.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
D17 22
Patent
active
D03288773
REFERENCES:
patent: 2728257 (1955-12-01), Rochobradsky
patent: 2755833 (1956-07-01), Quayle
patent: 3500393 (1970-03-01), Roberton et al.
patent: 4127053 (1978-11-01), Cohen
patent: 4269104 (1981-05-01), Cantos, Jr.
Burke Wallace R.
Jackson Marcus
Litman Richard C.
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