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发明名称
Building block or tile
摘要
申请公布号
US1758757(A)
申请公布日期
1930.05.13
申请号
US19280244957
申请日期
1928.01.06
申请人
NIEMANN HENRY H
发明人
NIEMANN HENRY H.
分类号
E04B2/36
主分类号
E04B2/36
代理机构
代理人
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