Bell

Details Bell Bell

1994-05-27

1995-02-21

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03556220

REFERENCES:
patent: D28197 (1898-01-01), Ander
patent: D338421 (1993-08-01), Huang
patent: 4436052 (1984-03-01), Schall

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