- Result
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                    2017/08/04 clamp induction coil for preheating pipeline  clamp induction coil for preheating pipeline (1)clamp induction coil for preheating pipeline (2) clamp induction coil for preheating pipeline (1)clamp induction coil for preheating pipeline (2)
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                    2017/08/04 air cooled flexible induction coils for preheating or post-welding air cooled flexible induction coils for preheating or post-welding (1)air cooled flexible induction coils for preheating or post-welding (2)air cooled flexible induction coils for preheating or post-welding (3)air cooled flexible induction coils for prehea… 
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                    2017/08/04  preheat induction coil preheat induction coil
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                    2017/08/04 induction preheating or post-welding for gas pipeline  induction preheating or post-welding for gas pipeline induction preheating or post-welding for gas pipeline
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                    2017/08/04  induciton preheating_n induciton preheating_n
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                    2017/08/04 clamp induction coil for preheating pipeline  clamp induction coil for preheating pipeline clamp induction coil for preheating pipeline
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                    2017/08/04 clamp induction coil for pipeline preheating  clamp induction coil for pipeline preheating clamp induction coil for pipeline preheating
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                    2017/08/04 air cooled flexible induction coil for preheating steel pipeline air cooled flexible induction coil for preheating steel pipeline 
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                    2017/08/04 air cooled clamp induction coil for preheating or post-welding pipeline  air cooled clamp induction coil for preheating or post-welding pipeline air cooled clamp induction coil for preheating or post-welding pipeline
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                    2017/08/02 induction preheating for drying crucible  induction preheating for drying crucible induction preheating for drying crucible

