Bell

Details Bell Bell

1991-05-07

1992-12-15

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03317200

REFERENCES:
patent: D22954 (1893-12-01), Heskier
patent: D272523 (1984-02-01), P'eng
patent: 3678705 (1972-07-01), Korwin

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