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发明名称
Adjustable automatic folding platform for step-ladders
摘要
申请公布号
US1817760(A)
申请公布日期
1931.08.04
申请号
US19290350336
申请日期
1929.03.27
申请人
PETERS
发明人
PETERS SPENCER M.;ROCHESTER ARTHUR B.
分类号
E06C1/393
主分类号
E06C1/393
代理机构
代理人
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