Earphone

Details Earphone Earphone

1987-12-17

1990-10-02

Bullock, B. J.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Speaker or housing therefor

Patent

active

D03110079

REFERENCES:
patent: D278234 (1985-04-01), Saito
patent: 4646872 (1987-03-01), Kamon et al.

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