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经营范围
发明名称
Safety ladder
摘要
申请公布号
US2368081(A)
申请公布日期
1945.01.23
申请号
US19430500516
申请日期
1943.08.30
申请人
MARSH GERALD M
发明人
MARSH GERALD M.
分类号
B63B29/20;E06C7/18
主分类号
B63B29/20
代理机构
代理人
主权项
地址
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