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A process for the calibration and for the control of alternating current - compensation - apparatuses floor forschungs - work according to the method of vermessungdes elliptically polarized electromagnetic field of the bodenstroeme
A process for the calibration and for the control of alternating current - compensation - apparatuses floor forschungs - work according to the method of vermessungdes elliptically polarized electromagnetic field of the bodenstroeme