Image: Mouse-patents-englebart-rid
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Description: Early mouse patents. (left to right) Opposing track wheels by Englebart, 11/70, 3541541. Ball and wheel by Rider, 9/74, 3835464. Ball and two rollers with spring by Opocentsky, 10/76, 3987685.
Title: Mouse-patents-englebart-rid
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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