Door chime

Details Door chime Door chime

1996-07-26

1997-07-29

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D03815943

REFERENCES:
patent: D208339 (1967-08-01), Stevenson
patent: D215187 (1969-09-01), Doggart
patent: D274992 (1984-08-01), Levin
patent: D275088 (1984-08-01), Kachi et al.
patent: D294471 (1988-03-01), Levin et al.

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