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手機： +86 13605342002
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地址：山東省德州市德城區新湖大街1192號
Tested by 50203ZY drilling team of Zhongyuan Petroleum Exploration Bureau, service time of our valve seat is 4-5 times longer than other brand valve seat.
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Tested by 50203ZY drilling team of Zhongyuan Petroleum Exploration Bureau, service time of our valve seat is 4-5 times longer than other brand valve seat.
