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发明名称
Dispositif de centrage pour tubage de puits de pétrole ou autres
摘要
申请公布号
FR1167840(A)
申请公布日期
1958.12.01
申请号
FRD1167840
申请日期
1956.11.27
申请人
BAKER OIL TOOLS, INC.
发明人
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
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地址
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