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发明名称
Well capper
摘要
申请公布号
US1803945(A)
申请公布日期
1931.05.05
申请号
US19300494976
申请日期
1930.11.11
申请人
RETHERFORD HORACE G;ELMORE SAMUEL T
发明人
RETHERFORD HORACE G.;ELMORE SAMUEL T.
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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