Telephone key expansion unit

Details Telephone key expansion unit Telephone key expansion unit

1995-06-02

1996-10-15

Asch, Jeffrey

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03746747

REFERENCES:
patent: D306027 (1990-02-01), Gagnon
patent: D306859 (1990-03-01), Helstab et al.
patent: D311918 (1990-11-01), Renard
patent: D312461 (1990-11-01), Ando
patent: D317920 (1991-07-01), Fuqua et al.
patent: D319235 (1991-08-01), Sato
patent: D340057 (1993-10-01), Wetzel et al.
patent: D346385 (1994-04-01), Wetzel et al.
patent: 4790007 (1988-12-01), Richter et al.
patent: 5373556 (1994-12-01), Johnson
B. A. Pargh, 1992 Spring/Summer Catalog, Panasonic 6X16 Electronic Modular Switching System, p. 330, 2nd Article from top at far right.

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