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发明名称
Verfahren zur Bildung von Hohlraeumen am Grunde von Bohrloechern durch Sprengung
摘要
申请公布号
DE745659(C)
申请公布日期
1944.03.16
申请号
DE1942K164822D
申请日期
1942.05.29
申请人
HEINRICH KAHLE
发明人
KAHLE HEINRICH
分类号
E21B43/263
主分类号
E21B43/263
代理机构
代理人
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地址
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