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发明名称
Method and apparatus for sealing well casings
摘要
申请公布号
US1801983(A)
申请公布日期
1931.04.21
申请号
US19290387376
申请日期
1929.08.21
申请人
SAYE JOHN F
发明人
SAYE JOHN F.
分类号
E21B33/12
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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