Telephone intercommunication set

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

Patent

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Details

D14144, D14252, 379436

Patent

active

D03253813

REFERENCES:
patent: D270155 (1983-08-01), Shimizu
patent: D294694 (1988-03-01), Stewart
patent: D295623 (1988-05-01), Gilberton
patent: D299030 (1988-12-01), Menn
patent: D309138 (1990-07-01), Ortiz de Arri
patent: D311398 (1990-10-01), Sugano
patent: 1067079 (1913-07-01), Thomas
patent: 3469336 (1969-09-01), Halperin
patent: 3843166 (1974-10-01), Barone
patent: 4233766 (1980-11-01), Doan
patent: 4332362 (1982-06-01), Leopold

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