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STS111-E-5226
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STS111-E-5226

July 25, 2011
Astronaut Franklin R. Chang-Diaz, STS-111 mission specialist, participates in the second scheduled session of extravehicular activity (EVA) for the STS-111 mission. During the 5-hour spacewalk, Chang-Diaz and Perrin completed installation of the Mobile Remote Servicer Base System (MBS) on the International Space Stations (ISS) railcar, the Mobile Transporter.


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