Bell

Details Bell Bell

1994-10-14

1996-01-02

Seifert, Ralf

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D11 82

Patent

active

D03657760

REFERENCES:
patent: 22321 (1893-04-01), Heinz
patent: D331720 (1992-12-01), Shyan
patent: D335831 (1993-05-01), Chen
patent: D338167 (1993-08-01), Huang
patent: D338421 (1993-08-01), Huang
patent: D354247 (1995-01-01), Huang

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