An improved clamping device for third-axis input device of mouse, comprises a hollow roller stage and a roller with a plurality positioning holes and pivotally arranged on the roller stage. The roller exposes out of the cover of the mouse. The roller stage has two pivot rods on front side thereof and...http://www.google.com.au/patents/US6340966?utm_source=gb-gplus-sharePatent US6340966 - Clamping device for third-axis input device of mouse
