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经营范围
发明名称
Eraser and chalk rail cleaner
摘要
申请公布号
US2234529(A)
申请公布日期
1941.03.11
申请号
US19380224295
申请日期
1938.08.11
申请人
MATHER JOHN C
发明人
MATHER JOHN C.
分类号
B43L21/02
主分类号
B43L21/02
代理机构
代理人
主权项
地址
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