Electrostatic writing tubes,申请号US19570658791-传众专利搜索

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发明名称	Electrostatic writing tubes
摘要
申请公布号	US2933556(A)	申请公布日期	1960.04.19
申请号	US19570658791	申请日期	1957.05.13
申请人	A. B. DICK COMPANY	发明人	JR. CASPER W. BARNES,
分类号	H01J31/06	主分类号	H01J31/06
代理机构		代理人
主权项
地址

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