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Yim Bun Patrick Kwan, Gerrit Maarten Bonnema, Erik Roelof Loopstra, Harmen Klaas Van Der Schoot, Gerjan Peter Veldhuis: Positioning device having two object holders. ASML Netherlands, Pillsbury Winthrop Shaw Pittman, February 5, 2008: USRE040043

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 mean ...