Telephone adapter for hearing aids,申请号US19480048992-传众专利搜索

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发明名称	Telephone adapter for hearing aids
摘要
申请公布号	US2659772(A)	申请公布日期	1953.11.17
申请号	US19480048992	申请日期	1948.09.13
申请人	O'HARA JANVIER F	发明人	O'HARA JANVIER F.
分类号	H04M1/215;H04M1/247	主分类号	H04M1/215
代理机构		代理人
主权项
地址

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