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发明名称
Ellipsograph
摘要
申请公布号
US2415283(A)
申请公布日期
1947.02.04
申请号
US19440531371
申请日期
1944.04.17
申请人
HOBSON OLIVER J
发明人
HOBSON OLIVER J.
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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