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经营范围
发明名称
Collapsible access platform and stair
摘要
申请公布号
US3113637(A)
申请公布日期
1963.12.10
申请号
US19620192484
申请日期
1962.05.04
申请人
UNITED STATES STEEL CORPORATION
发明人
JR. JOSEPH B. PASKO,
分类号
B66C7/00;E06C1/39
主分类号
B66C7/00
代理机构
代理人
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