Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1983-12-19
1985-08-06
Bullock, B. J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
Patent
active
D02799650
REFERENCES:
patent: D269417 (1983-06-01), Shintaku
patent: D275843 (1984-10-01), Sharenow
patent: 1351904 (1920-09-01), Hartman
patent: 1746437 (1930-02-01), Giles
patent: 2017132 (1935-10-01), Ricci
patent: 4171677 (1979-10-01), Hibell
Yankee Emergency Equipment, 1979, p. 21, Speakers all on the page.
Sireno, 1979, p. 5, Siren Speakers #44860, in lower left corner.
Bullock B. J.
Gitlin Suzanne N.
Kobishi Electric Co., Ltd.
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