IS: 731 - 1971 (with Amendment no. 2) : Specification for porcelain insulators for overhead power lines with a nominal voltage greater than 1000V

IS: 731 - 1971 (with Amendment no. 2) : Specification for porcelain insulators for overhead power lines with a nominal voltage greater than 1000V - New Delhi BIS 1972 - 29+2p

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