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发明名称
Instrument for drawing ellipses
摘要
申请公布号
US2499935(A)
申请公布日期
1950.03.07
申请号
US19450632652
申请日期
1945.12.04
申请人
C-THRU RULER COMPANY
发明人
SUTO PAUL A.
分类号
B43L11/04
主分类号
B43L11/04
代理机构
代理人
主权项
地址
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