Trackball

Details Trackball Trackball

1993-12-17

1995-08-29

Tung, Melanie H.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03617602

REFERENCES:
patent: D292600 (1987-11-01), Wagner
patent: D297952 (1988-10-01), Ishiwata
patent: D342241 (1993-12-01), Ashmun et al.
patent: D348083 (1994-06-01), Smith, III et al.
patent: 4952919 (1990-08-01), Nippoldt
patent: 5122654 (1992-06-01), Koh et al.

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