Acoustical horn for behind-the-ear hearing aid

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

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2499

Patent

active

D04172795

REFERENCES:
patent: D42295 (1912-03-01), Pape
patent: 4311206 (1982-01-01), Johnson
patent: 4556122 (1985-12-01), Goode
patent: 4652414 (1987-03-01), Schlaegel
patent: 4724922 (1988-02-01), Kalayjian

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