Bell

Details Bell Bell

1991-09-26

1993-02-23

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D11 57

Patent

active

D03334457

REFERENCES:
patent: D216230 (1969-12-01), Koziol
patent: D272523 (1984-02-01), P'eng

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