Improved manufacture of lead for pencils,申请号GB19310018632-传众专利搜索

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发明名称	Improved manufacture of lead for pencils
摘要
申请公布号	GB380177(A)	申请公布日期	1932.09.15
申请号	GB19310018632	申请日期	1931.06.27
申请人	MARTIN HAMMEL	发明人
分类号	B43K19/18	主分类号	B43K19/18
代理机构		代理人
主权项
地址

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