| 摘要 |
An X-Y position indicator control for manual movement over any surface to move a cursor over the display on a cathode ray tube, the indicator control generating signals indicating its position to cause a cursor to be displayed on the tube at the corresponding position. The indicator control mechanism contains X-Y position wheels mounted with their axes in perpendicular planes, which rotate according to the X and Y movements of the mechanism. As the position indicator control is moved along a surface each position wheel is resiliently urged into contact with the surface.
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