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Off-shore platform structure
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Patent number 4,674,919
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Issue date Jun 23, 1987
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Norwegian Contractors
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Olav Olsen
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Marine structure
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Patent number 4,304,506
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Issue date Dec 8, 1981
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A/S Hoyer-Ellefsen
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Olav Olsen
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Multi-purpose marine structure
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Patent number 4,239,417
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Issue date Dec 16, 1980
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A/S Hoyer-Ellefsen, Ing. T. Furuholmen A/S
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Arvid Slatten
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING