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发明名称
Ladder construction
摘要
申请公布号
US2301753(A)
申请公布日期
1942.11.10
申请号
US19410388176
申请日期
1941.04.11
申请人
SEABERG ERIC L
发明人
SEABERG ERIC L.
分类号
E06C1/22;E06C1/39
主分类号
E06C1/22
代理机构
代理人
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地址
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