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发明名称
Joist
摘要
申请公布号
US1990155(A)
申请公布日期
1935.02.05
申请号
US19310532837
申请日期
1931.04.25
申请人
LEONIE S. YOUNG
发明人
分类号
E04C3/20
主分类号
E04C3/20
代理机构
代理人
主权项
地址
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