Hand free phone

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

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Details

D14 61, D14 64, 179179

Patent

active

D02821664

REFERENCES:
patent: D158616 (1950-05-01), Rigby
patent: D227782 (1973-07-01), Hazell et al.
patent: D244145 (1977-04-01), Bliven
patent: D244209 (1977-05-01), Bliven
patent: D250109 (1978-10-01), Gengru et al.
patent: D258283 (1981-02-01), Stoddard
patent: D259196 (1981-05-01), Pardo
patent: D261764 (1981-11-01), Klerenik et al.
patent: D273490 (1984-04-01), Chen
patent: D274243 (1984-06-01), Asaki et al.
patent: D275753 (1984-10-01), Mahan

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