Telephone off-hook indicator

Details Telephone off-hook indicator Telephone off-hook indicator

1992-07-07

1993-11-16

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03413632

REFERENCES:
patent: D152922 (1949-03-01), Shipton
patent: D253281 (1979-10-01), Kim
patent: D306026 (1990-02-01), Boykiw
patent: D308664 (1990-06-01), Freeman et al.
patent: D311389 (1990-10-01), Festa et al.
patent: D314746 (1991-02-01), Benjamin
patent: D326267 (1992-05-01), Weiser et al.

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