STS41-C astronauts George Nelson, left, and James van Hoften work on the Solar Maximum Mission
satellite in the Challenger payload bay on April 11, 1984. Earlier in the mission astronauts had deployed the Long Duration Exposure Facility (LDEF). The LDEF had been secured in the payload bay
using four latches similar to this type of latch (shown with yellow arrow). A fifth latch on the floor of the payload bay completed the LDEF payload retention system. (NASA photo STS41C-38-1852)
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