Telephone calling dial device,申请号US19420432839-传众专利搜索

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发明名称	Telephone calling dial device
摘要
申请公布号	US2312566(A)	申请公布日期	1943.03.02
申请号	US19420432839	申请日期	1942.02.28
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	LUM GEORGE R.
分类号	H04M1/23	主分类号	H04M1/23
代理机构		代理人
主权项
地址

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