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发明名称
Concrete slab
摘要
申请公布号
US1819405(A)
申请公布日期
1931.08.18
申请号
US19290372460
申请日期
1929.06.20
申请人
BROOKS FRANK T
发明人
BROOKS FRANK T.
分类号
E04C2/04;E04C2/38
主分类号
E04C2/04
代理机构
代理人
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地址
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