Improvements relating to impulse transmitters for automatic telephone systems,申请号GB19320020621-传众专利搜索

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发明名称	Improvements relating to impulse transmitters for automatic telephone systems
摘要
申请公布号	GB407692(A)	申请公布日期	1934.03.21
申请号	GB19320020621	申请日期	1932.07.21
申请人	HALL TELEPHONE ACCESSORIES (1928) LIMITED;FREDERICK WILLIAM HALL	发明人
分类号	H04M1/274	主分类号	H04M1/274
代理机构		代理人
主权项
地址

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