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发明名称
Method of and apparatus for forming blackboard surfaces
摘要
申请公布号
US1932215(A)
申请公布日期
1933.10.24
申请号
US19310533196
申请日期
1931.04.27
申请人
WEBER COSTELLO CO.
发明人
JOHNSON JOHN F.;LAWTON ROBERT B.
分类号
B05B13/04
主分类号
B05B13/04
代理机构
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