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经营范围
发明名称
Loose leaf binder
摘要
申请公布号
US1964252(A)
申请公布日期
1934.06.26
申请号
US19320648915
申请日期
1932.12.27
申请人
ELMA N. DAWSON
发明人
DAWSON JAMES C.
分类号
B42F13/16
主分类号
B42F13/16
代理机构
代理人
主权项
地址
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