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经营范围
发明名称
Deep boring apparatus
摘要
申请公布号
US1934329(A)
申请公布日期
1933.11.07
申请号
US19290347483
申请日期
1929.03.16
申请人
BERNHARD RUHL
发明人
RUHL BERNHARD
分类号
E21B3/02;E21B6/00;E21B7/20;E21B10/32
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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