Inspeksjon i Svelgfoss-juvet: Det tyske kjemikonsernet BASF valgte i 1906 å delta i utbyggingene på Rjukan. Et besøk på Notodden med Sigurd Kloumann (nr. 2 f.v.) som omviser, var et ledd i prosessen. Her fra befaring av Svelgfoss-utbyggingen. (Foto: Hydro/NIA).
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