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经营范围
发明名称
Closure apparatus with removable plug
摘要
申请公布号
US3331385(A)
申请公布日期
1967.07.18
申请号
US19640398898
申请日期
1964.09.24
申请人
MODERN DRILLING TOOLS, INC.
发明人
TAYLOR WILLIAM T.
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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