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Puyang Zhongshi Cementing Tool Product Patent Certificate
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Internal balanced cement head patent certificate
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Non-welded cementing cement head patent certificate
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New self-priming float hoop patent certificate
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New float hoop floating shoes patent certificate新型浮箍浮鞋专利证书
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New float hoop patent certificate
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Patent certificate for oil and gas double sealed wellhead device
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Kawa type casing head sealing device patent certificate
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Single-stage slip type casing head patent certificate
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Patent certificate for casing head for workover
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Pressure pipe special license