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发明名称
Loose leaf binder
摘要
申请公布号
US1959858(A)
申请公布日期
1934.05.22
申请号
US19340706398
申请日期
1934.01.12
申请人
ELMA N. DAWSON
发明人
DAWSON JAMES C.
分类号
B42F13/40
主分类号
B42F13/40
代理机构
代理人
主权项
地址
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