IS: 9921 (part 4) - 1985; Specification for Alternating current disconnectors (Isolators) and earthing switches for voltages above 1000V Part 4 type tests and routine tests

IS: 9921 (part 4) - 1985; Specification for Alternating current disconnectors (Isolators) and earthing switches for voltages above 1000V Part 4 type tests and routine tests - New Delhi BIS 1985 - 39p

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