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Construction system for subway station
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Patent number 9,822,506
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Issue date Nov 21, 2017
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Guangzhou Jishi Construction Group Co., Ltd.
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Changyin Ding
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Patent number 5,556,676
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Issue date Sep 17, 1996
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Nisshin Chemical Industry Co. Ltd.
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Masafumi Fukumoto
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E21 - EARTH DRILLING MINING
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Apparatus for impregnating a tube
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Patent number 4,182,262
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Issue date Jan 8, 1980
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Underground Surveys Corporation
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Benjamin A. Everson
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3668368
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Issue date Jun 6, 1972
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3620025
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Issue date Nov 16, 1971
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E21 - EARTH DRILLING MINING
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3601158
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Patent number 3,601,158
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Issue date Jun 30, 1959
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1361583
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Issue date Dec 7, 1920
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E21 - EARTH DRILLING MINING