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发明名称
Ladder construction
摘要
申请公布号
US1926885(A)
申请公布日期
1933.09.12
申请号
US19320645247
申请日期
1932.12.01
申请人
RICH CHESTER A
发明人
RICH CHESTER A.
分类号
E06C7/08
主分类号
E06C7/08
代理机构
代理人
主权项
地址
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