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发明名称
Improvements in and relating to draughting apparatus
摘要
申请公布号
GB638865(A)
申请公布日期
1950.06.14
申请号
GB19470005814
申请日期
1948.02.23
申请人
DENNIS ARTHUR HUGHES
发明人
分类号
B43L13/00
主分类号
B43L13/00
代理机构
代理人
主权项
地址
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