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经营范围
发明名称
Improvements in or relating to drawing boards
摘要
申请公布号
GB326773(A)
申请公布日期
1930.03.18
申请号
GB19280037399
申请日期
1928.12.18
申请人
ARTHUR GRAY
发明人
分类号
B43L5/02
主分类号
B43L5/02
代理机构
代理人
主权项
地址
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