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Graphitkugel fuer Hochtemperaturreaktor cropped. Graphite Pebble for Pebble Bed Reactor Graphitkugel fr Hochtemperaturreaktor GraphitkugelfuerHochtemperaturreaktor GraphitkugelfuerHochtemperaturreaktor Stefan Khn derivative work Saibo white balance cropped Saibo GraphitkugelfuerHochtemperaturreaktor Uploaded with derivativeFX