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发明名称
Positioning device
摘要
申请公布号
US4866903(A)
申请公布日期
1989.09.19
申请号
US19840637377
申请日期
1984.08.02
申请人
FERSTAY, WILLIAM G.
发明人
FERSTAY, WILLIAM G.
分类号
E02D5/74;E04C5/18;E04C5/20;E21D21/00
主分类号
E02D5/74
代理机构
代理人
主权项
地址
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