China Steel ball valves fo GB Standards Search Result |
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GB/T 12237-2021 Steel ball valves for petroleum, petrochemical and allied industries 石油、石化及相关工业用的钢制球阀 - 英文版 |
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GB/T 12237-2007 Steel ball valves for petroleum, petrochemical and allied industries 石油、石化及相关工业用的钢制球阀 - 英文版 |
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