Improvements in or relating to frequency control methods and systems,申请号GB19280033517-传众专利搜索

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发明名称	Improvements in or relating to frequency control methods and systems
摘要
申请公布号	GB306525(A)	申请公布日期	1930.02.17
申请号	GB19280033517	申请日期	1928.11.15
申请人	ELECTRICAL RESEARCH PRODUCTS, INC.	发明人
分类号	G04C15/00	主分类号	G04C15/00
代理机构		代理人
主权项
地址

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