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Key words:Piston Ring, Piston Ring, Piston Ring Series, Piston Ring Series, Piston Ring Series, Piston Ring Series, Piston Ring Series, Piston Ring Series, Cylinder Ring Series

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    • Summary:

      Recently, Yizheng Shuanghuan another process technology - "a piston ring surface of the multi-layer composite hard PVD coating, piston rings and the preparation process" was awarded the national invention patents, authorized patent number: ZL20141004...Details>>

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