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发明名称
Drafting instrument
摘要
申请公布号
US2790240(A)
申请公布日期
1957.04.30
申请号
US19540409811
申请日期
1954.02.12
申请人
BERNARD SILVERSTEIN
发明人
SILVERSTEIN BERNARD
分类号
B43L11/055
主分类号
B43L11/055
代理机构
代理人
主权项
地址
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