Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1983-10-20
1985-08-13
Bullock, B. J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
Patent
active
D02800837
REFERENCES:
patent: D229701 (1973-12-01), Becker
patent: D275088 (1984-08-01), Kachi et al.
patent: 2470600 (1949-05-01), Bossard
Daly John J.
Levin Monte L.
Bullock B. J.
Gitlin Suzanne N.
Litchfield Stephen A.
Square D Company
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