Symmetrical high-frequency communication cables with cordel-polystyrene insulation, with copper conductors, in lead sheathing, with protective covering of BG type, designed for cable trunks, zone communication lines and connecting lines used in the frequency range up to 552 kHz or at application of secondary digital transmission systems in the frequency range up to 8448 kHz and operating at AC voltage of remote supply up to 690 V or DC voltage up to 1000 V
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