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经营范围
发明名称
Improvements in or relating to rulers and protractors
摘要
申请公布号
GB721845(A)
申请公布日期
1955.01.12
申请号
GB19520018360
申请日期
1952.07.21
申请人
ROBERT NIGHTINGALE
发明人
分类号
B43L7/04
主分类号
B43L7/04
代理机构
代理人
主权项
地址
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