Improvements in or relating to telephone instruments,申请号GB19380014835-传众专利搜索

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发明名称	Improvements in or relating to telephone instruments
摘要
申请公布号	GB514905(A)	申请公布日期	1939.11.21
申请号	GB19380014835	申请日期	1938.05.18
申请人	ASSOCIATED TELEPHONE & TELEGRAPH COMPANY	发明人
分类号	H04M1/03	主分类号	H04M1/03
代理机构		代理人
主权项
地址

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