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Gas Yield 295L-305L/Kg Calcium Carbide 50-80mm with Factory Price Made in China for Long-Term Acetylene Gas Plant Acetylene Production, Find Details and Price about Calcium Carbide Acetylene from Gas Yield 295L-305L/Kg Calcium Carbide 50-80mm with Factory Price Made in China for Long-Term Acetylene Gas Plant Acetylene Production - Haina Chemical Products Co., Ltd