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Because of the scarcity of published records of lightning performance of 220-kv power transmission lines, the A.I.E.E. lightning and insulator subcommittee∗has attempted to collect such data by means of a questionnaire sent to the various companies operating 220-kv lines in the United States and Canada. The data thus obtained is summarized in this paper.
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Sporn et al. (1934) studied this question.
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