Hearing aid

Details Hearing aid Hearing aid

1989-11-27

1991-12-03

Reid, Stella

Medical and laboratory equipment

Equipment for diagnosis, analysis, or treatment

Auricular

Patent

active

D03221261

REFERENCES:
patent: D180694 (1957-07-01), Norris
patent: D294562 (1988-03-01), Chao
patent: D294862 (1988-03-01), Diefenbach
patent: 2882348 (1959-04-01), Erickson
patent: 3045073 (1962-07-01), Vickerson
patent: 4727582 (1988-02-01), de Vries et al.

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