Improvements in and relating to internal telephone systems,申请号GB19570036109-传众专利搜索

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发明名称	Improvements in and relating to internal telephone systems
摘要
申请公布号	GB843809(A)	申请公布日期	1960.08.10
申请号	GB19570036109	申请日期	1957.11.20
申请人	OWSIEJ BARON	发明人
分类号	H04M9/00;H04M9/04	主分类号	H04M9/00
代理机构		代理人
主权项
地址

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