Telephone line noise suppressor

Details Telephone line noise suppressor Telephone line noise suppressor

1991-12-09

1993-10-19

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03404579

REFERENCES:
patent: D275667 (1984-09-01), Dellinger et al.
patent: D308664 (1990-06-01), Freeman et al.
patent: D312612 (1990-12-01), Seymour
patent: 2866868 (1958-12-01), Carlson et al.
patent: 4362905 (1982-12-01), Ismail
patent: 4373120 (1983-02-01), McDonald
patent: 4879437 (1989-11-01), Dard et al.
patent: 5099514 (1992-03-01), Acree

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