Door chime

Details Door chime Door chime

1996-07-26

1997-06-24

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D03801675

REFERENCES:
patent: D264196 (1982-05-01), Doggart
patent: D274992 (1984-08-01), Levin
patent: D275088 (1984-08-01), Kachi et al.
patent: D294471 (1988-03-01), Levin et al.
patent: D353345 (1994-12-01), Dawson
patent: D355143 (1995-02-01), Lee et al.

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