Home intercom unit

Details Home intercom unit Home intercom unit

1997-07-01

1998-10-06

Bullock, B. J.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Intercom

1403

Patent

active

D03992039

REFERENCES:
patent: D280097 (1985-08-01), Yamagata et al.
patent: D285681 (1986-09-01), Nakashima
patent: D305121 (1989-12-01), Pfeifer
patent: D307587 (1990-05-01), Marcune
patent: D371784 (1996-07-01), Gertz

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