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经营范围
发明名称
Improvements in or relating to loft ladders and sliding stairways
摘要
申请公布号
GB507177(A)
申请公布日期
1939.06.12
申请号
GB19370034282
申请日期
1937.12.10
申请人
EDWARD GEORGE KNAPMAN
发明人
分类号
E04F11/04
主分类号
E04F11/04
代理机构
代理人
主权项
地址
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