Flush mount duplex-pivoting speaker unit

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

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Details

D14221, 1401

Patent

active

D04195612

REFERENCES:
patent: D188542 (1960-08-01), Levy et al.
patent: D320020 (1991-09-01), Iwano
patent: D393641 (1998-04-01), Hai-Fu
patent: 511617 (1893-12-01), Howard
patent: 2496589 (1950-02-01), Marquis
patent: 4853966 (1989-08-01), Skrzycki
patent: 5133428 (1992-07-01), Perrson
patent: 5303209 (1994-04-01), Frasl

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