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Mission STS-111

The mobile base provides a moveable work platform and storage facility for astronauts during space walks. Since the mobile base has four grapple fixtures, it can serve as a base for both Canadarm2 and the Special Purpose Dexterous Manipulator simultaneously. Since it will be mounted on an American provided Mobile Transporter (MT), the MBS can move key elements to their required worksite by sliding along a track system mounted along the entire width of the Station.