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发明名称
Picture holder
摘要
申请公布号
US2506509(A)
申请公布日期
1950.05.02
申请号
US19460681260
申请日期
1946.07.03
申请人
KRATKOWSKI JOHN F
发明人
KRATKOWSKI JOHN F.
分类号
A47G1/06
主分类号
A47G1/06
代理机构
代理人
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