Headphone control box

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment

Patent

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D14299

Patent

active

D03308960

REFERENCES:
patent: D250025 (1978-10-01), Stout
patent: D265199 (1982-06-01), Urban et al.
patent: D318279 (1991-07-01), Laiacona et al.
patent: D325733 (1992-04-01), Suzuki et al.
Video Review, Nov. 1989, p. 36, bottom-Stax Lambda Pro Signature headphones.

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