Improvements in drawing instruments,申请号GB19380003762-传众专利搜索

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发明名称	Improvements in drawing instruments
摘要
申请公布号	GB510878(A)	申请公布日期	1939.08.08
申请号	GB19380003762	申请日期	1938.02.07
申请人	REGINALD ARTHUR FIRMAN	发明人
分类号	B43L13/22	主分类号	B43L13/22
代理机构		代理人
主权项
地址

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