Call charging telephone exchange system,申请号US19300463945-传众专利搜索

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发明名称	Call charging telephone exchange system
摘要
申请公布号	US1837206(A)	申请公布日期	1931.12.22
申请号	US19300463945	申请日期	1930.06.26
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	COLLIS RAYMOND E.
分类号	H04M15/10	主分类号	H04M15/10
代理机构		代理人
主权项
地址

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