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发明名称
Portfolio
摘要
申请公布号
US2378020(A)
申请公布日期
1945.06.12
申请号
US19430475576
申请日期
1943.02.11
申请人
LANGWORTHY NORVAL B
发明人
LANGWORTHY NORVAL B.
分类号
B42F7/00
主分类号
B42F7/00
代理机构
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