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经营范围
发明名称
Prestressed concrete joist and slab construction
摘要
申请公布号
US3302348(A)
申请公布日期
1967.02.07
申请号
US19640336250
申请日期
1964.01.07
申请人
PERL-TILE COMPANY
发明人
PRATT CLARENCE A.
分类号
E04B1/94;E04C3/26;E04C3/29;E04C5/16
主分类号
E04B1/94
代理机构
代理人
主权项
地址
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