Bell

Details Bell Bell

1992-07-08

1994-10-25

Feifer, Melvin B.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D21160

Patent

active

D03518086

REFERENCES:
patent: D66243 (1924-12-01), Negbaur
patent: D155855 (1949-11-01), White
patent: D248586 (1978-07-01), Nakao et al.
patent: 1756077 (1930-04-01), Zadek
patent: 4050342 (1977-09-01), Suzuki et al.

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