Base reflex cone device for base reflex cabinets

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

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D14221

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D03599582

REFERENCES:
patent: D68218 (1925-09-01), Rubes
patent: D101684 (1936-10-01), Sweeny
patent: 677476 (1901-07-01), Short
patent: 1711258 (1929-04-01), Bennett
patent: 1767679 (1930-06-01), Hutchison
patent: 2873812 (1959-02-01), Avedon
patent: 2957054 (1960-10-01), Levy et al.
patent: 4811816 (1989-03-01), Len

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