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Stefan Ratke and Jörg Hofmann
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Stefan Ratke and Jörg Hofmann
Stefan Ratke and Jörg Hofmann
Stefan Ratke and Jörg Hofmann
Apprentice and instructor: Stefan Ratke (left) and Jörg Hofmann (right) in the DLR training centre at Cologne.
Credit:
DLR (CC-BY 3.0).
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