Sound modifying attachment disk for loudspeakers

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

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D03391388

REFERENCES:
patent: D215853 (1969-11-01), Zar et al.
patent: D291601 (1987-08-01), D'Antonio et al.
patent: 2077170 (1937-04-01), Harrison
patent: 4135601 (1979-01-01), Tsukagoshi et al.
patent: 4898260 (1990-02-01), Fang
patent: 4939703 (1990-07-01), Muller

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