Bell

Details Bell Bell

1991-07-24

1993-01-26

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D11 49

Patent

active

D03327582

REFERENCES:
patent: D140889 (1945-04-01), Barbieri
patent: D272523 (1984-02-01), P'eng

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