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Drilling rig and drilling method
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Patent number 8,322,458
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Issue date Dec 4, 2012
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Bauer Maschinen GmbH
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Erwin Emil Stoetzer
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Auger bit
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Patent number 7,571,781
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Issue date Aug 11, 2009
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Bauer Maschinen GmbH
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Erwin Stoetzer
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E21 - EARTH DRILLING MINING
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Soil working method and apparatus
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Patent number 7,559,161
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Issue date Jul 14, 2009
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Bauer Maschinen GmbH
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Erwin Stoetzer
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Construction apparatus
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Patent number 7,559,377
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Issue date Jul 14, 2009
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Bauer Maschinen GmbH
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Erwin Stoetzer
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E21 - EARTH DRILLING MINING
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Tube coupling for tube elements
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Patent number 7,559,583
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Issue date Jul 14, 2009
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Bauer Maschinen GmbH
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Erwin Stoetzer
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Trench wall cutter
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Patent number 5,924,222
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Issue date Jul 20, 1999
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Bauer Spezialtiefbau GmbH
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Erwin Stoetzer
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING