Mechanical pencil with lead sharpening device,申请号US19490131640-传众专利搜索

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发明名称	Mechanical pencil with lead sharpening device
摘要
申请公布号	US2548649(A)	申请公布日期	1951.04.10
申请号	US19490131640	申请日期	1949.12.07
申请人	BRADY WILLIAM E	发明人	BRADY WILLIAM E.
分类号	B43K29/06	主分类号	B43K29/06
代理机构		代理人
主权项
地址

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