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经营范围
发明名称
Improvements relating to ladders
摘要
申请公布号
GB632311(A)
申请公布日期
1949.11.21
申请号
GB19470001064
申请日期
1947.01.13
申请人
SIDNEY VICTOR LESTER
发明人
分类号
E06C7/42
主分类号
E06C7/42
代理机构
代理人
主权项
地址
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