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The interactive mobile system RoboX is presented. Ten such robots will propose tours to visitors of the swiss national exposition during five month, seven days a week, ten hours per day. Algorithms are to find and track dynamic objects through the exposition are presented and evaluated. Thus, RoboX can initiate a conversation and propose tours to visitors, all the while reacting to their movement. [paper in german] ---- Dieser Beitrag beschreibt das interaktive mobile System RoboX. Auf der Schweizer National-ausstellung Expo.02 werden zehn solcher Roboter dem Publikum Touren durch eine Ausstellung anbieten. In diesem Beitrag werden Algorithmen zum Finden und Verfolgen von bewegten Objekten vorgestellt und getestet, um zu Besucher gezielt anzusprechen und auf ihre Bewegungen zu reagieren.