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发明名称
Drafting utensil
摘要
申请公布号
US2233481(A)
申请公布日期
1941.03.04
申请号
US19400324904
申请日期
1940.03.20
申请人
HELEN KUEHL
发明人
KUEHL HELEN
分类号
B43L7/027
主分类号
B43L7/027
代理机构
代理人
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