Hearing aid

Medical and laboratory equipment – Equipment for diagnosis – analysis – or treatment – Auricular

Patent

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Patent

active

D03545687

REFERENCES:
patent: D219983 (1971-02-01), Bosch et al.
patent: D294862 (1988-03-01), Diefenbach
patent: D322319 (1991-12-01), van Mourik

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