SIS SS 424 16 17-1988 Telecommunication cables PE-insulated PVC-sheathed PE-sheathedscreened lead-in cable type ELKAL《通信电缆 聚乙烯绝缘，聚氯乙烯护套，聚乙烯护套屏蔽铅电缆，ELKAL类型》.pdf

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