Step-by-step lead pencil,申请号US19380217112-传众专利搜索

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发明名称	Step-by-step lead pencil
摘要
申请公布号	US2179835(A)	申请公布日期	1939.11.14
申请号	US19380217112	申请日期	1938.07.02
申请人	WARD HUGH A	发明人	WARD HUGH A.
分类号	B43K21/22	主分类号	B43K21/22
代理机构		代理人
主权项
地址

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