An improved writing board for use with rotary holders for filing-cards,申请号GB19530011981-传众专利搜索

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发明名称	An improved writing board for use with rotary holders for filing-cards
摘要
申请公布号	GB720944(A)	申请公布日期	1954.12.29
申请号	GB19530011981	申请日期	1953.04.30
申请人	NILS SKOGEN	发明人
分类号	B42F17/28	主分类号	B42F17/28
代理机构		代理人
主权项
地址

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