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发明名称
Chalk trough
摘要
申请公布号
US2763937(A)
申请公布日期
1956.09.25
申请号
US19500156550
申请日期
1950.04.18
申请人
URBAIN LEON F
发明人
URBAIN LEON F.
分类号
A47B97/04
主分类号
A47B97/04
代理机构
代理人
主权项
地址
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