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You now：Home > English > About us > Certificates > The patent certificate
Mobile oil-free vacuum drying device patent
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Cured in Place lining for old pipeline rehabilitat
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Patent for Thick-walled HDPE pipe deformation devi
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New non-thermal desorption-type compressed air dry
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New non-thermal desorption-type compressed air pat
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New patent-pending patent
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Strengthening and repairing the casing pipe with c
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Pressure testing air exhausting device patent
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Oil entrance petroleum and sand separation device
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