Door chime

Details Door chime Door chime

1996-07-26

1997-08-19

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D03825027

REFERENCES:
patent: D201593 (1965-07-01), Stevenson
patent: D215187 (1969-09-01), Doggart
patent: D264196 (1982-05-01), Doggart

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