Extension ringing console apparatus for a telephone set

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

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D03751007

REFERENCES:
patent: D259933 (1981-07-01), Foggia et al.
patent: D266086 (1982-09-01), Foggia et al.
patent: D271394 (1983-11-01), Brown et al.
patent: D282745 (1986-02-01), Brown
patent: D300028 (1989-02-01), To
patent: D312461 (1990-11-01), Ando
patent: D318660 (1991-07-01), Weber
patent: D328300 (1992-07-01), Hattori et al.
patent: D334571 (1993-04-01), Westwood

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