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发明名称
Frame for letter blocks
摘要
申请公布号
US2561813(A)
申请公布日期
1951.07.24
申请号
US19480050828
申请日期
1948.09.23
申请人
EDWARD F. MURPHY
发明人
MURPHY JOSEPH F.
分类号
B41B11/00
主分类号
B41B11/00
代理机构
代理人
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