Improvements in telephonic receivers and loud speakers,申请号GB19320000460-传众专利搜索

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发明名称	Improvements in telephonic receivers and loud speakers
摘要
申请公布号	GB390584(A)	申请公布日期	1933.04.13
申请号	GB19320000460	申请日期	1932.01.07
申请人	FREDERICK WILLIAM LANCHESTER	发明人
分类号	H04R9/02	主分类号	H04R9/02
代理机构		代理人
主权项
地址

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