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经营范围
发明名称
Rotatable drawing board and attached straightedge
摘要
申请公布号
US1843824(A)
申请公布日期
1932.02.02
申请号
US19290401760
申请日期
1929.10.23
申请人
LA FRANCE ALFRED
发明人
FRANCE ALFRED LA
分类号
B43L13/02
主分类号
B43L13/02
代理机构
代理人
主权项
地址
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