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发明名称
Sign holding device
摘要
申请公布号
US2110555(A)
申请公布日期
1938.03.08
申请号
US19370148263
申请日期
1937.06.15
申请人
PFAFF JR HENRY C
发明人
JR. HENRY C. PFAFF,
分类号
G09F7/20
主分类号
G09F7/20
代理机构
代理人
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