FIELD: communication equipment. SUBSTANCE: information signal is transmitted over ferromagnetic communication line. Ferromagnetic communication line is exposed to action of magnetic field in process of signal transmission. Output inductance coil mutually inductively coupled to input inductance coil located at transmitting end of communication line is subjected to action of magnetic field in point of signal reception. EFFECT: possibility of transmission of information over underground and above-ground pipe-lines. 7 cl, 7 dwg
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