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method and schaltungsanordnung for elimination of stoerenden wechselstroemen whose frequency of the messstromes differs in the electromagnetic bodenerforschung by quantitative measurement of the electromagnetic field of the bodenstroeme
method and schaltungsanordnung for elimination of stoerenden wechselstroemen whose frequency of the messstromes differs in the electromagnetic bodenerforschung by quantitative measurement of the electromagnetic field of the bodenstroeme