Method of forming blackboard surfaces,申请号US19320638456-传众专利搜索

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发明名称	Method of forming blackboard surfaces
摘要
申请公布号	US1956220(A)	申请公布日期	1934.04.24
申请号	US19320638456	申请日期	1932.10.19
申请人	WEBER COSTELLO CO.	发明人	JOHNSON JOHN F.;LAWTON ROBERT B.
分类号	B43L1/10	主分类号	B43L1/10
代理机构		代理人
主权项
地址

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