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发明名称
Article retriever
摘要
申请公布号
US2964204(A)
申请公布日期
1960.12.13
申请号
US19570698974
申请日期
1957.11.26
申请人
WALD INDUSTRIES, INC.
发明人
WILSON RUFUS W.
分类号
E01F9/014;E01H1/00;E03B3/04
主分类号
E01F9/014
代理机构
代理人
主权项
地址
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