Headset for the hearing impaired

Details Headset for the hearing impaired Headset for the hearing impaired

1986-07-15

1989-09-19

Zarfas, Louis S.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Speaker or housing therefor

Patent

active

D03035310

REFERENCES:
patent: D287849 (1987-01-01), O'Malley et al.
patent: 326303 (1866-07-01), Scanlon
patent: 1544136 (1925-06-01), Dietrich
patent: 1581237 (1926-04-01), Spielman

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