Track ball

Details Track ball Track ball

1993-01-22

1994-09-20

Burke, Wallace R.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03507360

REFERENCES:
patent: D316253 (1991-04-01), Riddiford et al.
patent: D332446 (1993-01-01), Lin
patent: D336747 (1993-06-01), Chao
patent: D340042 (1993-10-01), Copper et al.
patent: D340706 (1993-10-01), Hu

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