Conferencing telephone unit

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

Patent

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Details

D14 33, D 6148, D1403, D0603

Patent

active

D02597861

REFERENCES:
patent: D192637 (1962-04-01), Judson
patent: D212004 (1968-08-01), Emond
patent: D227478 (1973-06-01), Ekdahl
patent: D244468 (1977-05-01), Buchin
patent: 3931867 (1976-01-01), Janszen
patent: 4078155 (1978-03-01), Botros et al.
patent: 4184048 (1980-01-01), Alcaide

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