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发明名称
Stair structure
摘要
申请公布号
US1894463(A)
申请公布日期
1933.01.17
申请号
US19320587947
申请日期
1932.01.21
申请人
JULIUS FRICK
发明人
FRICK JULIUS
分类号
E04F11/116
主分类号
E04F11/116
代理机构
代理人
主权项
地址
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