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发明名称
Disappearing stairway
摘要
申请公布号
US1811707(A)
申请公布日期
1931.06.23
申请号
US19280294275
申请日期
1928.07.20
申请人
THE BESSLER DISAPPEARING STAIRWAY COMPANY
发明人
BESSLER FRANK 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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