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发明名称
Loose-leaf binder book
摘要
申请公布号
US2186436(A)
申请公布日期
1940.01.09
申请号
US19390267798
申请日期
1939.04.14
申请人
SAUL SHALER
发明人
SHALER SAUL
分类号
B42F17/34
主分类号
B42F17/34
代理机构
代理人
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地址
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