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发明名称
LADDERS
摘要
申请公布号
US3504768(A)
申请公布日期
1970.04.07
申请号
USD3504768
申请日期
1968.06.21
申请人
JOSEPH EMMETT BOYD
发明人
JOSEPH EMMETT BOYD
分类号
E06C1/39;(IPC1-7):E04G1/34
主分类号
E06C1/39
代理机构
代理人
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