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发明名称
Stairway
摘要
申请公布号
US2721472(A)
申请公布日期
1955.10.25
申请号
US19520278056
申请日期
1952.03.22
申请人
发明人
MCAVER WALTER JAMES
分类号
E04F11/022
主分类号
E04F11/022
代理机构
代理人
主权项
地址
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