Desk telephone station with built-in freespeaking device

Recording – communication – or information retrieval equipment – Computer – data processor equipment

Patent

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D1403

Patent

active

D02444690

REFERENCES:
patent: D225745 (1973-01-01), Haaheim et al.
patent: D229192 (1973-11-01), Nakamura
patent: D229193 (1973-11-01), Kamakura
patent: D237505 (1975-11-01), Thies

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