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Tunnel drive shield
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Patent number 4,474,494
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Issue date Oct 2, 1984
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Gewerkschaft Eisenhutte Westfalia
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Dieter Stuckmann
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E21 - EARTH DRILLING MINING
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Tunnel driving apparatus
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Patent number 4,432,665
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Issue date Feb 21, 1984
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Gewerkschaft Eisenhutte Westfalia
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Dieter Stuckmann
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E21 - EARTH DRILLING MINING
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Tunnel driving apparatus
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Patent number 4,398,845
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Issue date Aug 16, 1983
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Gewerkschaft Eisenhutte Westfalia
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Dieter Stuckmann
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E21 - EARTH DRILLING MINING
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Tunnel drive shield
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Patent number 4,334,800
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Issue date Jun 15, 1982
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Gewerkschaft Eisenhutte Westfalia
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Dieter Stuckmann
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E21 - EARTH DRILLING MINING
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Tunnel drive shield
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Patent number 4,265,565
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Issue date May 5, 1981
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Gewerkschaft Eisenhutte Westfalia
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Dieter Stuckmann
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E21 - EARTH DRILLING MINING
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