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发明名称
Gravity action palette attachment for drawing table tops
摘要
申请公布号
US2683640(A)
申请公布日期
1954.07.13
申请号
US19510226426
申请日期
1951.05.15
申请人
MANGINE LOUIS M
发明人
MANGINE LOUIS M.
分类号
B43M99/00
主分类号
B43M99/00
代理机构
代理人
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