Bell

Details Bell Bell

1991-09-25

1993-02-23

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D11 49

Patent

active

D03334430

REFERENCES:
patent: D142728 (1945-10-01), Morrow
patent: D159638 (1950-08-01), Katz
patent: D166355 (1952-04-01), Philippe
patent: D272523 (1984-02-01), P'eng

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