Door answering system

Details Door answering system Door answering system

1998-07-23

1999-09-07

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04135415

REFERENCES:
patent: D238258 (1975-12-01), Duris
patent: D333796 (1993-03-01), Bannon
patent: D344034 (1994-02-01), Gottlieb
patent: D376118 (1996-12-01), Morris

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