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发明名称
Vorrichtung zum Loesen der mit Konus befestigten Gesteinsbohrkoepfe von den Bohrstangen
摘要
申请公布号
DE743363(C)
申请公布日期
1943.12.23
申请号
DE1942R112199D
申请日期
1942.02.17
申请人
EMIL RICHTER
发明人
RICHTER EMIL
分类号
E21B19/18
主分类号
E21B19/18
代理机构
代理人
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地址
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