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发明名称
DRILLING METHODS AND APPARATUS EMPLOYING OUT-OF-PHASE PRESSURE VARIATIONS IN A DRILLING FLUID
摘要
申请公布号
CA834595(A)
申请公布日期
1970.02.17
申请号
CAD834595
申请日期
申请人
THE HUGHES TOOL COMPANY
发明人
HENRY B. WOODS;EDWARD M. GALLE
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