Earphone

Details Earphone Earphone

1987-12-18

1991-03-12

Bullock, B. J.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03153509

REFERENCES:
patent: 4455457 (1984-06-01), Akira
patent: 4736435 (1988-04-01), Yokoyama et al.

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