Ergonomic trackball

Details Ergonomic trackball Ergonomic trackball

1995-06-09

1996-10-22

Nunn, Freda

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03748677

REFERENCES:
patent: D331398 (1992-12-01), Clouss et al.
patent: 4862165 (1989-08-01), Gart
patent: 4917516 (1990-04-01), Retter
patent: 4952919 (1990-08-01), Nippoldt
patent: 5355147 (1994-10-01), Lear

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