DEVICE FOR STEERING A DRILLING TOOL AND/OR MULTIPLE DRILL ROD UNIT
TREVELLYN MOELLER COLTMAN, BERNHARD PREVEDELL, ALFRED ERIC WALTER FLETCHER
Year of Publication 29.03.1989
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Year of Publication 29.03.1989
Patent
DEVICE FOR GUIDING A DRILLING TOOL AND/OR PIPE STRING
PREVEDEL, BERNHARD, COLTMAN, TREVELLYN, MOELLER, FLETCHER, ALFRED, ERIC, WALTER
Year of Publication 29.12.1988
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Year of Publication 29.12.1988
Patent
DEVICE FOR GUIDING A DRILLING TOOL AND/OR PIPE STRING
PREVEDEL, BERNHARD, COLTMAN, TREVELLYN, MOELLER, FLETCHER, ALFRED, ERIC, WALTER
Year of Publication 31.05.1989
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Year of Publication 31.05.1989
Patent
ANORDNING FOR STYRING AV ET BOREVERKTOEY OG/ELLER ET ROER
COLTMAN, TREVELLYN MOELLER, PREVEDEL, BERNARD, FLETCHER, ALFRED ERIC WALTER
Year of Publication 12.04.1989
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Year of Publication 12.04.1989
Patent