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发明名称
Zentralgespuelte Gesteinsbohrer
摘要
申请公布号
DE1408678(A1)
申请公布日期
1968.10.10
申请号
DE19611408678
申请日期
1961.01.20
申请人
FRIEDRICH KRUPP GMBH
发明人
KARL NOLL,ALBERT
分类号
E21B21/00;E21C
主分类号
E21B21/00
代理机构
代理人
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地址
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