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Foerfarande och anordning foer maetning av luftgenomslaeppningsfoermaogan hos luftgenomslaeppliga vaevnader i synnerhet en vira eller en filt i en pappersmaskin.
Verfahren und Gerät zur Messung der Tonermenge auf einem bandförmigen Bildträger und Verfahren und Gerät zur Detektierung des Oberflächenzustandes eines bandförmigen Bildträgers