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skriftsporet skal forløbe vinkelret på hastighedsskrivefeltets midterste periferi (ved diagramark i skiveform) eller på dets aksel (ved diagramark i strimmelform)
the trace drawn by the stylus must be perpendicular to the average circumference (in the case of record sheets in disc form) or to the axis (in the case of record sheets in strip form) of the area reserved for speed recording,