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发明名称
Closure operator
摘要
申请公布号
US2773687(A)
申请公布日期
1956.12.11
申请号
US19530382711
申请日期
1953.09.28
申请人
KOEHLER VERNON W
发明人
KOEHLER VERNON W.
分类号
E05F17/00
主分类号
E05F17/00
代理机构
代理人
主权项
地址
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