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发明名称
Letter sheet
摘要
申请公布号
US1960054(A)
申请公布日期
1934.05.22
申请号
US19310564446
申请日期
1931.09.22
申请人
JOHNSON HAROLD B
发明人
JOHNSON HAROLD B.
分类号
B42D15/08
主分类号
B42D15/08
代理机构
代理人
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