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发明名称
Paper file
摘要
申请公布号
US2018641(A)
申请公布日期
1935.10.22
申请号
US19340749386
申请日期
1934.10.22
申请人
ART METAL CONSTRUCTION COMPANY
发明人
JOHNSON JOHN A.
分类号
B42F19/00
主分类号
B42F19/00
代理机构
代理人
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