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经营范围
发明名称
Tubing plug
摘要
申请公布号
US2257269(A)
申请公布日期
1941.09.30
申请号
US19400360000
申请日期
1940.10.07
申请人
MARSH HARRY C;QUILTER WILLIAM M
发明人
MARSH HARRY C.;QUILTER WILLIAM M.
分类号
E21B33/04
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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