PC telephone amplifier switch box

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

Patent

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Details

D13162, D14107, D14243, 1403

Patent

active

D04240650

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patent: D396471 (1998-07-01), Kolinen
patent: D396850 (1998-08-01), Ito
patent: D413893 (1999-09-01), Luzbetak et al.
patent: D415743 (1999-10-01), Inukai

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