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发明名称
Stair form
摘要
申请公布号
US1799405(A)
申请公布日期
1931.04.07
申请号
US19300425789
申请日期
1930.02.04
申请人
NATHANIEL BOIS
发明人
BOIS NATHANIEL
分类号
E04F11/025
主分类号
E04F11/025
代理机构
代理人
主权项
地址
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