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发明名称
Method of and means for making bore holes
摘要
申请公布号
GB382792(A)
申请公布日期
1932.11.03
申请号
GB19310033908
申请日期
1931.12.07
申请人
JOHANNES ANTHONIUS ALPHONSUS MEKEL;WALTER FRANCISCUS CORNELIS BAARS
发明人
分类号
E21B7/15
主分类号
E21B7/15
代理机构
代理人
主权项
地址
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