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Shield tunneling machine
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Patent number 7,073,869
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Issue date Jul 11, 2006
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Nakakuro Construction Co., Ltd.
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Kenichi Nakakuro
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E21 - EARTH DRILLING MINING
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Tunnel boring machine
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Patent number 5,104,262
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Issue date Apr 14, 1992
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Atlas Copco Construction and Mining Technique AB
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Jan H. Forsberg
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E21 - EARTH DRILLING MINING
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3814481
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Patent number 3,814,481
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Issue date Jun 4, 1974
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E21 - EARTH DRILLING MINING
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3773387
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Patent number 3,773,387
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Issue date Nov 20, 1973
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E21 - EARTH DRILLING MINING
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3713700
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Patent number 3,713,700
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Issue date Jan 30, 1973
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E21 - EARTH DRILLING MINING
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3603100
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Patent number 3,603,100
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Issue date Sep 7, 1971
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E21 - EARTH DRILLING MINING
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3545811
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Patent number 3,545,811
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Issue date Dec 8, 1970
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E21 - EARTH DRILLING MINING
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3486572
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Patent number 3,486,572
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Issue date Dec 30, 1969
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E21 - EARTH DRILLING MINING
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3387893
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Patent number 3,387,893
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Issue date Jun 11, 1968
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E21 - EARTH DRILLING MINING
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3232670
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Patent number 3,232,670
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Issue date Feb 1, 1966
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E21 - EARTH DRILLING MINING