Piezo electric frequency eliminator,申请号US19270176546-传众专利搜索

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发明名称	Piezo electric frequency eliminator
摘要
申请公布号	US1827843(A)	申请公布日期	1931.10.20
申请号	US19270176546	申请日期	1927.03.18
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	GREEN ESTILL I.
分类号	H03C1/52	主分类号	H03C1/52
代理机构		代理人
主权项
地址

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