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Graded Lump 50-80mm Calcium Carbide for Acetylene Generation with Reliable Gas Production, Find Details and Price about Graded Lump 50-80mm Calcium Carbide Acetylene Generation Calcium Carbide from Graded Lump 50-80mm Calcium Carbide for Acetylene Generation with Reliable Gas Production - Wuhai TYWH Chemical Industry Co., Ltd.