China Silica sand and flou GB Standards Search Result |
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GB/T 12214-2019 Silica sand and flour for investment casting 熔模铸造用硅砂、粉 - 英文版 |
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GB/T 12214-1990 Silica sand and flour for investment casting 熔模铸造用硅砂、粉 - 英文版 |
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