Keyboard

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

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Patent

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D03655520

REFERENCES:
patent: D323817 (1992-02-01), Buchin
patent: D340445 (1993-10-01), Marquardt et al.
patent: D341134 (1993-11-01), Marquardt et al.
patent: D346376 (1994-04-01), Marquardt et al.
Ergonomische Tastaturgestaltung from Fraunhofer-Institut Design For An Ergonomic Keyboard.

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