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发明名称
Retractable stairs
摘要
申请公布号
US2564954(A)
申请公布日期
1951.08.21
申请号
US19480023274
申请日期
1948.04.26
申请人
BRELSFORD DAVID E
发明人
BRELSFORD DAVID E.
分类号
E04F11/04
主分类号
E04F11/04
代理机构
代理人
主权项
地址
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