Headphone

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor

Patent

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1401

Patent

active

D04230124

REFERENCES:
patent: D348466 (1994-07-01), Yamatogi
patent: D358391 (1995-05-01), Isono
patent: D376598 (1996-12-01), Hayashi
patent: D386181 (1997-11-01), Fisher
Sony Catalog 87, pp. 250-251, Nov. 1997.

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