Improvements in or relating to alternating current signalling systems,申请号GB19320001720-传众专利搜索

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发明名称	Improvements in or relating to alternating current signalling systems
摘要
申请公布号	GB395418(A)	申请公布日期	1933.07.20
申请号	GB19320001720	申请日期	1932.01.20
申请人	STANDARD TELEPHONES AND CABLES, LIMITED;THOMAS SAMUEL SKILLMAN;PHILIP ROBERT THOMAS;KENNETH GEORGE HODGSON	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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