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发明名称
MECHANISCHE BOHRLOCH-SCHLAGSCHERE
摘要
申请公布号
DD257101(A5)
申请公布日期
1988.06.01
申请号
DD19870303491
申请日期
1987.06.03
申请人
DAILEY PETROLEUM SERVICES
发明人
TENG,CHUAN C.,US;CHAPELLE,RENE A.,US;BLACKLAWS,JOHN E.,GB;MCCOMSEY,LEE E.,US
分类号
E21B7/08;E21B7/04;E21B31/107;(IPC1-7):E21B31/107
主分类号
E21B7/08
代理机构
代理人
主权项
地址
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