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经营范围
发明名称
Improvements in or relating to stairways
摘要
申请公布号
GB305991(A)
申请公布日期
1930.02.06
申请号
GB19290004606
申请日期
1929.02.11
申请人
THE BESSLER DISAPPEARING STAIRWAY COMPANY
发明人
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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