Means for utilising the form factor of alternating currents for signalling or other systems,申请号GB19310019978-传众专利搜索

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发明名称	Means for utilising the form factor of alternating currents for signalling or other systems
摘要
申请公布号	GB381940(A)	申请公布日期	1932.10.11
申请号	GB19310019978	申请日期	1931.07.11
申请人	CHARLES ABBOTT BEER	发明人
分类号	H04Q1/446	主分类号	H04Q1/446
代理机构		代理人
主权项
地址

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