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Device for the electrical ground research, in which, in order to induce the wechselstroeme in the bottom, two parallel, the examination region difference engage end, of equiphase and conductor gleichfrequentem alternating current flows, the supply cables are laid in such a way that their induction effects on the examination region are practically to neglect
Device for the electrical ground research, in which, in order to induce the wechselstroeme in the bottom, two parallel, the examination region difference engage end, of equiphase and conductor gleichfrequentem alternating current flows, the supply cables are laid in such a way that their induction effects on the examination region are practically to neglect