Extension attachment for a telephone earpiece

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

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D03114015

REFERENCES:
patent: D31187 (1899-07-01), Cool
patent: D142133 (1945-08-01), Woodruff
patent: D181667 (1957-12-01), Oylen
patent: D183019 (1958-06-01), Porter
patent: D185520 (1959-06-01), Van Den Berg
patent: D216802 (1970-03-01), Kliewer
patent: D241350 (1976-09-01), Kao et al.
patent: D305235 (1989-12-01), Moore
patent: 1586140 (1926-05-01), Bonnette
patent: 2468721 (1948-04-01), Volkmann
patent: 4803720 (1989-02-01), Utoh et al.

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