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发明名称
Closure-operator
摘要
申请公布号
US2689726(A)
申请公布日期
1954.09.21
申请号
US19510225751
申请日期
1951.05.11
申请人
PURDY FREDERICK A
发明人
PURDY FREDERICK A.
分类号
E05F15/12
主分类号
E05F15/12
代理机构
代理人
主权项
地址
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