The river runs from lake Aursunden[?] near Røros in Sør-Trøndelag and runs into the Oslofjord[?] at Sarpsborg.
... to a smaller extent by the slipping friction. The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,3 ...