Telephone handset filter

Details Telephone handset filter Telephone handset filter

1992-01-21

1993-09-07

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03391418

REFERENCES:
patent: D181927 (1958-01-01), Gray
patent: D214322 (1969-06-01), Velasquez
patent: D283128 (1986-03-01), Bate
patent: D291306 (1987-08-01), Espinosa
patent: D307753 (1990-05-01), Oliver
patent: D320798 (1991-10-01), Holt
patent: D320799 (1991-10-01), Holt
patent: 2700075 (1955-01-01), Korn
patent: 2985724 (1961-05-01), Sickelsmith et al.
patent: 3243527 (1966-03-01), Sternheim
patent: 4058690 (1977-11-01), Serkez

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