Earphone

Details Earphone Earphone

1990-07-31

1992-11-17

Feifer, Melvin B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03310612

REFERENCES:
patent: D318864 (1991-08-01), Daido et al.
patent: D318865 (1991-08-01), Ichikawa
patent: 3829624 (1974-08-01), Goodin et al.

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