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发明名称
Improvements connected with protractors
摘要
申请公布号
GB551781(A)
申请公布日期
1943.03.09
申请号
GB19420003469
申请日期
1942.03.16
申请人
JOHN DONALD MACLEAN
发明人
分类号
B43L7/00
主分类号
B43L7/00
代理机构
代理人
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