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发明名称
Multiple stage anchoring device
摘要
申请公布号
US2589484(A)
申请公布日期
1952.03.18
申请号
US19510221350
申请日期
1951.04.17
申请人
RAYMOND ECUER
发明人
ECUER RAYMOND
分类号
E21D21/00
主分类号
E21D21/00
代理机构
代理人
主权项
地址
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