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经营范围
发明名称
A device for facilitating the drawing of the normal at a point on a plane curve
摘要
申请公布号
GB672563(A)
申请公布日期
1952.05.21
申请号
GB19500006769
申请日期
1950.03.17
申请人
ASSOCIATED ELECTRICAL INDUSTRIES LIMITED
发明人
DYSON JAMES
分类号
B43L13/18
主分类号
B43L13/18
代理机构
代理人
主权项
地址
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