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Ball valve experts for the Qingdao Yingli Machinery Group valves do ball valve knowledge and technology training

Ball valve expert Zhang Qi Feng was invited to Qingdao Yingli Machinery Group valve for the ball valve knowledge and technology training for the future cooperation between the two sides to lay the foundation for valve.

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Ball valve experts for the Qingdao Yingli Machinery Group valves do ball valve knowledge and technology training

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