Tip for mechanical lead pencils,申请号US19290348162-传众专利搜索

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发明名称	Tip for mechanical lead pencils
摘要
申请公布号	US1907926(A)	申请公布日期	1933.05.09
申请号	US19290348162	申请日期	1929.03.19
申请人	PENCIL MECHANISM CORPORATION	发明人	WOELM ALFRED
分类号	B43K21/24	主分类号	B43K21/24
代理机构		代理人
主权项
地址

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