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经营范围
发明名称
Core drilling
摘要
申请公布号
US2364088(A)
申请公布日期
1944.12.05
申请号
US19400348736
申请日期
1940.07.31
申请人
MILLER HAROLD C;BERWALD WILLIAM B;TALIAFERRO JR DAVID BEN
发明人
MILLER HAROLD C.;BERWALD WILLIAM B.;JR. DAVID BEN TALIAFERRO,
分类号
E21B25/08
主分类号
E21B25/08
代理机构
代理人
主权项
地址
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