Headphones

Recording – communication – or information retrieval equipment – Computer – data processor equipment

Patent

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Details

D14 76, D1401

Patent

active

D02696118

REFERENCES:
patent: D215217 (1969-09-01), Noyes
patent: D227267 (1973-06-01), Scanlon
patent: D229425 (1973-11-01), McCabe
patent: D231613 (1974-05-01), Sarber
patent: D246782 (1977-12-01), Saiya

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