Data processing system

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

Patent

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D1402

Patent

active

D02674904

REFERENCES:
patent: D196917 (1963-11-01), Brueggeman
patent: D229697 (1973-12-01), Davis et al.
patent: D236357 (1975-08-01), Clayton
patent: D242926 (1977-01-01), Abrahamsen et al.
patent: 4235494 (1980-11-01), Chu et al.

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