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Two American astronauts floated outside the International Space Station Friday for the third spacewalk this month aimed at repairing the orbiting outpost's robotic arm and replacing old video cameras.A key piece of equipment called the latching end effector was replaced during the October 5 spacewalk.Further lubrication work was done on the Oct. 10 spacewalk, and a new high definition video camera was also installed outside the research lab.Russian cosmonauts have ventured out on one spacewalk this year.
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