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发明名称
Casing head
摘要
申请公布号
US1848307(A)
申请公布日期
1932.03.08
申请号
US19270237225
申请日期
1927.12.02
申请人
ALEXANDER BOYNTON
发明人
BOYNTON ALEXANDER
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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