Three-way call detector unit

Details Three-way call detector unit Three-way call detector unit

1993-02-24

1994-05-10

Holtje, Nelson C.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D13184

Patent

active

D03468062

REFERENCES:
patent: D285554 (1986-09-01), Beaumont et al.
patent: D295178 (1988-04-01), Pedinielli et al.
patent: D308664 (1990-06-01), Freeman et al.
patent: D312627 (1990-12-01), Gutzmer
patent: D314746 (1991-02-01), Benjamin et al.
patent: D338193 (1993-08-01), Sasaki
patent: D339788 (1993-09-01), Leman et al.
patent: 3896384 (1975-07-01), Henderson
patent: 4313025 (1982-01-01), Grube, Jr.

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