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发明名称
Directory board and the like
摘要
申请公布号
US2019107(A)
申请公布日期
1935.10.29
申请号
US19340705499
申请日期
1934.01.06
申请人
WEBER JOHN A
发明人
WEBER JOHN A.
分类号
G09F7/08
主分类号
G09F7/08
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代理人
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