Ringing adapter box for telephone

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

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D14256

Patent

active

D03682650

REFERENCES:
patent: D255882 (1980-07-01), Kim
patent: D275101 (1984-08-01), Read
patent: D314746 (1991-02-01), Benjamin et al.
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patent: D331394 (1992-12-01), Kobayashi et al.
patent: D342073 (1993-12-01), Nakamura et al.
patent: D346378 (1994-04-01), Smylie
patent: D348070 (1994-06-01), Vallillee
patent: D353372 (1994-12-01), Delhaes

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