A pointing device provides a rotating member for rotatably adjusting a location of a cursor, a volume level, display settings, or other variables. The pointing device includes a control arm which a user can manipulate to make a button selection. The pointing device combines the button selection and rotational...http://www.google.de/patents/US6075518?utm_source=gb-gplus-sharePatent US6075518 - Rotational X-axis pointing device
