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Shield tunneling machine
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Patent number 4,629,362
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Issue date Dec 16, 1986
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Ishikawajima-Harima Jukogyo Kabushiki Kaisha
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Norio Kainuma
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E21 - EARTH DRILLING MINING
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Drive shield
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Patent number 4,143,519
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Issue date Mar 13, 1979
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Gewerkschaft Eisenhutte Westfalia
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Eberhard Unger
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E21 - EARTH DRILLING MINING
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Tunnelling shields
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Patent number 3,969,906
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Issue date Jul 20, 1976
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Charcon Tunnels Limited
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Rupert John Sidney McBean
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E21 - EARTH DRILLING MINING
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3919851
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Patent number 3,919,851
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Issue date Nov 18, 1975
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E21 - EARTH DRILLING MINING
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3889480
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Patent number 3,889,480
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Issue date Jun 17, 1975
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E21 - EARTH DRILLING MINING
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3850000
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Patent number 3,850,000
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Issue date Nov 26, 1974
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E21 - EARTH DRILLING MINING
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3834170
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Patent number 3,834,170
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Issue date Sep 10, 1974
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E21 - EARTH DRILLING MINING
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3657897
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Patent number 3,657,897
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Issue date Apr 25, 1972
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E21 - EARTH DRILLING MINING
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3550389
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Patent number 3,550,389
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Issue date Dec 29, 1970
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E21 - EARTH DRILLING MINING
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3487649
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Patent number 3,487,649
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Issue date Jan 6, 1970
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E21 - EARTH DRILLING MINING
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2419329
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Patent number 2,419,329
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Issue date Apr 22, 1947
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E21 - EARTH DRILLING MINING