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发明名称
Drafting board with magnetic t-square
摘要
申请公布号
US3137072(A)
申请公布日期
1964.06.16
申请号
US19610126970
申请日期
1961.07.26
申请人
NELL T. HENSON
发明人
TERRY WILLIAM B.
分类号
B43L13/04
主分类号
B43L13/04
代理机构
代理人
主权项
地址
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