Switching apparatus for telephone set

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

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1403

Patent

active

D03950484

REFERENCES:
patent: D224714 (1972-09-01), Wenzler
patent: D301877 (1989-06-01), Greenberg et al.
patent: D309298 (1990-07-01), Pushelberg
patent: D342073 (1993-12-01), Nakamura et al.
patent: D352941 (1994-11-01), Bolton, Jr.
patent: D353144 (1994-12-01), Brandt et al.
patent: D355196 (1995-02-01), Nakamura
patent: D355658 (1995-02-01), Brandt et al.
patent: D380199 (1997-06-01), Beruscha et al.
patent: 4652969 (1987-03-01), Stegenga

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