Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent
1982-09-14
1985-01-29
Lucas, Susan J.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Telephone equipment
Patent
active
D02773848
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patent: 3727030 (1973-04-01), McMurtry
patent: 3735142 (1973-05-01), Harr et al.
patent: 3784794 (1974-01-01), Allais
patent: 3947817 (1976-03-01), Requa
patent: 3976973 (1976-08-01), Martin et al.
patent: 4115703 (1978-09-01), Dobras
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