Hearing aid plastic ear pieces,申请号US19550526126-传众专利搜索

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发明名称	Hearing aid plastic ear pieces
摘要
申请公布号	US2939923(A)	申请公布日期	1960.06.07
申请号	US19550526126	申请日期	1955.08.03
申请人	HENDERSON JOHN D	发明人	HENDERSON JOHN D.
分类号	H04R1/10;H04R25/00;H04R25/04	主分类号	H04R1/10
代理机构		代理人
主权项
地址

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