Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent
1994-05-04
1995-05-02
Dunn, Freda S.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Telephone equipment
Patent
active
D03579115
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Grant Alan H.
Helmetsie Eugene A.
Dunn Freda S.
Ergonomics, Inc.
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