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发明名称
Verfahren zur Herstellung von Bohrloechern in nachgiebigen lockeren Massen
摘要
申请公布号
DE712533(C)
申请公布日期
1941.10.21
申请号
DE1936S122838D
申请日期
1936.05.30
申请人
SIEMENS-SCHUCKERTWERKE AKT.-GES.
发明人
分类号
E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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