Bell

Details Bell Bell

1993-06-28

1994-05-03

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03465632

REFERENCES:
patent: D259032 (1981-04-01), Reyes
patent: D331720 (1992-12-01), Shyan
patent: D335831 (1993-05-01), Chen
patent: D338847 (1993-08-01), Huang

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