Combined hearing aid volume control knob and adapter ring

Details Combined hearing aid volume control knob and adapter ring Combined hearing aid volume control knob and adapter ring

1979-09-07

1982-03-02

O'Keefe, Veronica

Medical and laboratory equipment

Equipment for diagnosis, analysis, or treatment

Orthopedic or chiropractic

D13 32, D2499

Patent

active

D02632535

REFERENCES:
patent: D178175 (1956-07-01), Dunning
patent: 1025992 (1912-05-01), Pape
patent: 2188591 (1940-01-01), Carlson
patent: 2521423 (1950-09-01), Stuck
patent: 3374318 (1968-03-01), Martin

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