Device for use as a learning aid for conveying a user's voice to

Details Device for use as a learning aid for conveying a user's voice to Device for use as a learning aid for conveying a user's voice to

1994-10-18

1996-12-31

Reid, Stella

Medical and laboratory equipment

Equipment for diagnosis, analysis, or treatment

Auricular

Patent

active

D03770982

REFERENCES:
patent: D193343 (1962-08-01), MacFarlane
patent: D203115 (1965-12-01), MacFarlane
patent: 3182746 (1965-05-01), Schaefer, II
patent: 3259204 (1966-07-01), Gerwick

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