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发明名称
Folding and disappearing stairs
摘要
申请公布号
US1767148(A)
申请公布日期
1930.06.24
申请号
US19250026271
申请日期
1925.04.27
申请人
BERTHOLD V. MARSCHKE
发明人
MARSCHKE REINHOLD B.
分类号
E04F11/06
主分类号
E04F11/06
代理机构
代理人
主权项
地址
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