Speaker and listening device,申请号US19350032619-传众专利搜索

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发明名称	Speaker and listening device
摘要
申请公布号	US2161995(A)	申请公布日期	1939.06.13
申请号	US19350032619	申请日期	1935.07.22
申请人	CAHILL ARTHUR T	发明人	CAHILL ARTHUR T.
分类号	H04R1/10;H04R5/02	主分类号	H04R1/10
代理机构		代理人
主权项
地址

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