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发明名称
Well cementing device
摘要
申请公布号
US1859593(A)
申请公布日期
1932.05.24
申请号
US19310561857
申请日期
1931.09.09
申请人
BAKER OIL TOOLS, INC.
发明人
MELLIN OSCAR A.
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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