A positioning device has first and second object holders that are guided over a guiding surface extending parallel to an X-direction and parallel to a Y-direction perpendicular to the X-direction and which are displaceable over the guiding surface from a first position into a second position by means...http://www.google.de/patents/US6262796?utm_source=gb-gplus-sharePatent US6262796 - Positioning device having two object holders
