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经营范围
发明名称
Choked reverse circulating sub
摘要
申请公布号
US2903074(A)
申请公布日期
1959.09.08
申请号
US19560611863
申请日期
1956.09.25
申请人
LAYTON GERALD E;ARBUCKLE WALTER K
发明人
LAYTON GERALD E.;ARBUCKLE WALTER K.
分类号
E21B21/10;E21B34/06
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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