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发明名称
Floating and cementing plug
摘要
申请公布号
US1776613(A)
申请公布日期
1930.09.23
申请号
US19290332770
申请日期
1929.01.16
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
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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