Portable telephone amplifier unit

Details Portable telephone amplifier unit Portable telephone amplifier unit

1989-12-07

1992-05-19

Fay, Jr., Horace B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D14140

Patent

active

D03262677

REFERENCES:
patent: D226487 (1973-03-01), Genaro et al.
patent: D266085 (1982-09-01), Perhaeside
patent: D269432 (1983-06-01), Kowalik et al.
patent: D282179 (1986-01-01), Yuen
patent: D287127 (1986-12-01), Yuen
patent: D302689 (1989-08-01), Murakami et al.
patent: D311541 (1990-10-01), Carre
patent: 2402341 (1946-06-01), Patterson
patent: 2498153 (1950-02-01), Bussieres
patent: 2506715 (1950-05-01), Ffolliott

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