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发明名称
Magnetic t square and drafting board
摘要
申请公布号
US2568575(A)
申请公布日期
1951.09.18
申请号
US19490123275
申请日期
1949.10.24
申请人
WICKMAN LESTER F
发明人
WICKMAN LESTER F.
分类号
B43L13/04
主分类号
B43L13/04
代理机构
代理人
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