Electrical signal device and system,申请号US19330697417-传众专利搜索

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发明名称	Electrical signal device and system
摘要
申请公布号	US2065409(A)	申请公布日期	1936.12.22
申请号	US19330697417	申请日期	1933.11.10
申请人	SIGNAL ENGINEERING & MANUFACTURING COMPANY	发明人	WHEELOCK JOHN H.
分类号	H04M19/04	主分类号	H04M19/04
代理机构		代理人
主权项
地址

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