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发明名称
Hectograph
摘要
申请公布号
US1892077(A)
申请公布日期
1932.12.27
申请号
US19320609116
申请日期
1932.05.04
申请人
THE CLASSROOM TEACHER, INC.
发明人
REARDON HARVEY J.
分类号
B41L9/08
主分类号
B41L9/08
代理机构
代理人
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