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经营范围
发明名称
Loose leaf binder
摘要
申请公布号
US1896839(A)
申请公布日期
1933.02.07
申请号
US19310519136
申请日期
1931.02.28
申请人
ELMA N. DAWSON
发明人
DAWSON JAMES C.
分类号
B42F13/26
主分类号
B42F13/26
代理机构
代理人
主权项
地址
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