Tinfos II – i et vassdrag med muligheter: Utbyggingen på østsiden av Tinnefossen ga strøm til et jernverk på Notodden fra 1913. Omtrent på samme tid grep statsminister Gunnar Knudsen sjansen og kjøpte både Grønvollfoss og Årlifoss. (Foto: Tinfos/NIA).
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