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发明名称
Apparatus for raising roofs
摘要
申请公布号
US2160446(A)
申请公布日期
1939.05.30
申请号
US19380233695
申请日期
1938.10.06
申请人
STALFORT JOHN A
发明人
STALFORT JOHN A.
分类号
E04G23/02
主分类号
E04G23/02
代理机构
代理人
主权项
地址
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