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经营范围
发明名称
Cement retainer
摘要
申请公布号
US2704126(A)
申请公布日期
1955.03.15
申请号
US19510235754
申请日期
1951.07.09
申请人
DAVIDSON VERNON D
发明人
DAVIDSON VERNON D.
分类号
E21B33/129
主分类号
E21B33/129
代理机构
代理人
主权项
地址
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