Woofer

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

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1401

Patent

active

D04147715

REFERENCES:
patent: D282657 (1986-02-01), Caren
patent: D343676 (1994-01-01), Lim
patent: D360636 (1995-07-01), Sasage et al.
patent: D382877 (1997-08-01), Cheng
patent: 3073203 (1963-01-01), Evans
patent: 3143182 (1964-08-01), Sears et al.
Schoner Wohnen, p. 92, Subwoofer, Sep. 1987.

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