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发明名称
Sheet protector
摘要
申请公布号
US2630122(A)
申请公布日期
1953.03.03
申请号
US19520266958
申请日期
1952.01.17
申请人
AMBERG FILE & INDEX COMPANY
发明人
AMBERG GILBERT W.
分类号
B42F3/00
主分类号
B42F3/00
代理机构
代理人
主权项
地址
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