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发明名称
HORIZONTALBOHRUNGS-WIRBELEINRICHTUNG UND VERFAHREN HIERFUER
摘要
申请公布号
DE4003969(A1)
申请公布日期
1990.08.16
申请号
DE19904003969
申请日期
1990.02.09
申请人
BAKER-HUGHES INC., HOUSTON, TEX., US
发明人
HOPMANN, MARK E., BROKEN ARROW, OKLA., US
分类号
E21B37/00;E21B41/00
主分类号
E21B37/00
代理机构
代理人
主权项
地址
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