Improvements in adjustable blackboards,申请号GB19630046788-传众专利搜索

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发明名称	Improvements in adjustable blackboards
摘要
申请公布号	GB997620(A)	申请公布日期	1965.07.07
申请号	GB19630046788	申请日期	1963.11.27
申请人	FRIEDRICH BONG	发明人
分类号	A47B97/06	主分类号	A47B97/06
代理机构		代理人
主权项
地址

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