IEC 60141-4 Amd.1 Ed. 1.0 b:1990
Amendment 1 – Tests on oil-filled and gas-pressure cables and their accessories. Part 4: Oil-impregnated paper-insulated high pressure oil-filled pipe-type cables and accessories for alternating voltages up to and including 400 kV
Amendment by International Electrotechnical Commission, 10/15/1990
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