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Graphitkugel fuer Hochtemperaturreaktor. Graphite Pebble for Pebble Bed Reactor Graphitkugel fr Hochtemperaturreaktor own Aufgenommen im EdelsteinMuseum in IdarOberstein Deutschland Stefan Khn GFDL Ccbysa migrated Ccbysa Graphitkugel fuer Hochtemperaturreaktor cropped Spheres Graphite Nuclear fuels Photographs by User Stefan