Hearing aid earpiece,申请号US19430507438-传众专利搜索

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发明名称	Hearing aid earpiece
摘要
申请公布号	US2430229(A)	申请公布日期	1947.11.04
申请号	US19430507438	申请日期	1943.10.23
申请人	ZENITH RADIO CORPORATION	发明人	KELSEY ELIZABETH L.
分类号	H04R25/00	主分类号	H04R25/00
代理机构		代理人
主权项
地址

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