Doorbell button

Details Doorbell button Doorbell button

1999-05-11

2000-03-21

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04217276

REFERENCES:
patent: D339760 (1993-09-01), Zucero et al.
patent: D404673 (1999-01-01), Gordon et al.

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