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Riefler Fig.. en Fig Intermittent seconds contact from Die Uhrenanlage der Hauptstation fr Erdbebenforschung am physikalischen Staatslaboratorium zu Hamburg de Fig Intermittierender SekundenKontakt von Die Uhrenanlage der Hauptstation fr Erdbebenforschung am physikalischen Staatslaboratorium zu Hamburg google id mXoyAQAAIAAJ