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发明名称
STEINBOHRMEISSEL UND VERFAHREN ZU SEINER ANWENDUNG
摘要
申请公布号
DE2829834(A1)
申请公布日期
1979.01.25
申请号
DE19782829834
申请日期
1978.07.07
申请人
GLADSTONE,JOHN NORMAN
发明人
NORMAN GLADSTONE,JOHN
分类号
E21B7/20;E21B10/34;E21B10/66;(IPC1-7):E21B11/00
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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