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发明名称
Parallel rule and protractor
摘要
申请公布号
US2332100(A)
申请公布日期
1943.10.19
申请号
US19420444946
申请日期
1942.05.29
申请人
DONALD MACLEAN JOHN
发明人
MACLEAN JOHN DONALD
分类号
B43L7/00
主分类号
B43L7/00
代理机构
代理人
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地址
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