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发明名称
Well apparatus
摘要
申请公布号
US2946388(A)
申请公布日期
1960.07.26
申请号
US19550533610
申请日期
1955.09.12
申请人
HALLIBURTON OIL WELL CEMENTING COMPANY
发明人
EVANS ROBERT T.
分类号
E21B33/1295
主分类号
E21B33/1295
代理机构
代理人
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地址
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