STAS 5131-1956 《船舶器械 正常、转角用、戴套筒的钢铸阀式开关大小》.pdf

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STAS 5079-1955 《船舶器械正常、直型以及带套筒的钢铸阀式开关大小》.pdf

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STAS 5132-1956 《船舶器械 正常转角用带套筒的钢铸阀式开关 形状及大小》.pdf

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