Doorbell button

Details Doorbell button Doorbell button

1998-04-30

1999-01-26

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04046730

REFERENCES:
patent: D172021 (1954-04-01), Grohsgal
patent: D172092 (1954-05-01), Grohsgal
patent: D174792 (1955-05-01), Bishop
patent: D392576 (1998-03-01), Pun
patent: 2573924 (1951-11-01), Miller

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