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发明名称
Form for constructing steps
摘要
申请公布号
US2389397(A)
申请公布日期
1945.11.20
申请号
US19440539539
申请日期
1944.06.09
申请人
ZIMMERMAN RALPH O
发明人
ZIMMERMAN RALPH O.
分类号
E04G13/06
主分类号
E04G13/06
代理机构
代理人
主权项
地址
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