Door chime

Details Door chime Door chime

1982-03-12

1984-08-14

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D02750880

REFERENCES:
patent: D199446 (1964-10-01), Stevenson
patent: D201593 (1965-07-01), Stevenson
patent: D253753 (1979-12-01), Poesl
patent: D258424 (1981-03-01), Doggart
patent: D264196 (1982-05-01), Doggart

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