Combined hearing aid and geriatric amplifier

Details Combined hearing aid and geriatric amplifier Combined hearing aid and geriatric amplifier

1991-09-12

1994-03-01

Reid, Stella

Medical and laboratory equipment

Equipment for diagnosis, analysis, or treatment

Auricular

Patent

active

D03448002

REFERENCES:
patent: D167873 (1952-09-01), Watson
patent: D187926 (1960-05-01), Boldt
patent: D300852 (1989-04-01), Sunderland et al.
patent: 2564425 (1951-08-01), Corso et al.
patent: 2585191 (1952-02-01), Tresise et al.

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