Telephone substation apparatus,申请号US19320638679-传众专利搜索

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发明名称	Telephone substation apparatus
摘要
申请公布号	US2008287(A)	申请公布日期	1935.07.16
申请号	US19320638679	申请日期	1932.10.20
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	LUM GEORGE R.
分类号	H04M1/08	主分类号	H04M1/08
代理机构		代理人
主权项
地址

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