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发明名称
Marker
摘要
申请公布号
US1769468(A)
申请公布日期
1930.07.01
申请号
US19280297308
申请日期
1928.08.03
申请人
SEARCY BENJAMIN N
发明人
SEARCY BENJAMIN N.
分类号
G09F3/14
主分类号
G09F3/14
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代理人
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