STAS 9979 3-1990 Indoor bushings with outer metal fitting of 7 2 and 12 kV stress class 12 5 kN FITTINGS Dimensions《外部有金属零件的室内绝缘衬套，7，2 和 12 千伏，压力级12 5千牛，配件尺寸 》.pdf

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