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Regarding shape of pointing device rubber cap, the large surface of the cap contributes to make a good usability.
English (United States)
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Rubber Cap of Pointing Device for Notebook PC
Disclosed is shape of pointing device rubber cap for notebook type of PC(Personal Computer). The following photograph shows the outside view of the rubber cap which is fitted on the top of the pointing stick. The diameter of the rubber cap top surface is lager than that of the bottom cylinder part. This large surface of the cap contributes to make a good usability because the wide surface keeps a good friction between the cap and user's finger.
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Soft Dome Type Soft Rim Type Legacy
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Disclosed by International Business Machines Corporation