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Navigation shoe for the blind
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Modified phenol formaldehyde foam board
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Corrosion inhibitor for oil pipeline
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Core drill with cuttings exhauster
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Electric lifting seat
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Leakage repairing system of oil transportation pipeline
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Rock-core drill
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Oil pipeline leakage mending device
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Carbon-fiber electric heating pad
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Carbon fiber electric heating tile
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Casing pipe for producing well
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Geological hammer with magnifying glass
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