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Anordning for styrning, spolning och strommatning for band- eller tradformiga elektroder i bearbetningszoner i elektriskt materialavdragande bearbetningsanleggningar
Metodo e dispositivo di servo con trollo della ampiezza dell'interspa zio tra un elettrodo utensile ed un pezzo da lavorare in una macchinaper la lavorazione a scarica elettrica