Pencil lead,申请号US19500138930-传众专利搜索

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发明名称	Pencil lead
摘要
申请公布号	US2645582(A)	申请公布日期	1953.07.14
申请号	US19500138930	申请日期	1950.01.16
申请人	J. S. STAEDTLER, MARS-BLEISTIFTFABRIK	发明人	LOY GEORG
分类号	C09D13/00	主分类号	C09D13/00
代理机构		代理人
主权项
地址

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