Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1984-07-26
1986-06-03
Bullock, B. J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
Patent
active
D02840693
REFERENCES:
patent: D180406 (1957-06-01), Jolly
patent: D235722 (1975-07-01), Rettick
patent: D258424 (1981-03-01), Doggart
patent: D264196 (1982-05-01), Doggart
patent: D280082 (1985-08-01), Levin et al.
Bullock B. J.
Gitlin Suzanne N.
Litchfield Stephen A.
Square D Company
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