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Formula of traditional Chinese medicine used for treating gastroesophageal reflux disease
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Metal valve seals structure
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Production tree boll-weevil hanger
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The latent wellhead for production of electricity
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Spiral duct machinery
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Surface pipe hanger
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Multi-functional heavy caliber oil recovery (gas) wellhead assembly
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Hole plate type throttle valve monoblock type valve seat
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Wedge shape of surging choke valve
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Ball-and-seat
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Vertical turbine with wind-collecting cover
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Built-in mechanical quick coupling device for prestressed concrete tubular pile
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Magnetic suspension non-friction double rotor generator
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Magnetic suspension zero-friction dual-rotor generator
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Making method for plane macromolecule compound material heating sheet and its heating base material
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