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经营范围
发明名称
Combined casing head and blow-out preventer
摘要
申请公布号
US1811013(A)
申请公布日期
1931.06.23
申请号
US19300435404
申请日期
1930.03.13
申请人
HUMASON GRANVILLE A
发明人
HUMASON GRANVILLE A.
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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