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US6484382B1
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Method of providing an internal circumferential shoulder in a cylindrical passageway
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US6158718A
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Gate valve
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US6176310B1
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Assembly for sealing the annulus between concentric cylindrical surfaces
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US5908046A
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Back seat rising stem gate valve
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US5951066A
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Connecting system for wellhead components
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US6012519A
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Full bore tubing hanger system
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US5984008A
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Installable load shoulder for use in a wellhead to support a tubing hanger
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US5743288A
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Valve having provision for replacing stem packing while the valve is under pressure
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US5746453A
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High temperature inline expansion joint
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