Improvements in or relating to telephone systems,申请号GB19280038469-传众专利搜索

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发明名称	Improvements in or relating to telephone systems
摘要
申请公布号	GB326584(A)	申请公布日期	1930.03.20
申请号	GB19280038469	申请日期	1928.12.31
申请人	BERTRAM SYDNEY COHEN	发明人
分类号	H04M1/60	主分类号	H04M1/60
代理机构		代理人
主权项
地址

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