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发明名称
Safety device for cable tool drilling rigs
摘要
申请公布号
US2596362(A)
申请公布日期
1952.05.13
申请号
US19500145636
申请日期
1950.02.23
申请人
BRANDT AXEL H;RAASCH ARTHUR J
发明人
BRANDT AXEL H.;RAASCH ARTHUR J.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
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地址
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