Blackboard,申请号US19300503406-传众专利搜索

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发明名称	Blackboard
摘要
申请公布号	US1865863(A)	申请公布日期	1932.07.05
申请号	US19300503406	申请日期	1930.12.19
申请人	KRAFT CHARLES H	发明人	KRAFT CHARLES H.
分类号	B43L1/06	主分类号	B43L1/06
代理机构		代理人
主权项
地址

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