Bone conduction audiphone,申请号US19390266757-传众专利搜索

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发明名称	Bone conduction audiphone
摘要
申请公布号	US2262082(A)	申请公布日期	1941.11.11
申请号	US19390266757	申请日期	1939.04.08
申请人	DICTOGRAPH PRODUCTS COMPANY, INC.	发明人	ZARTH WILLIAM A.
分类号	H04R1/14;H04R11/00	主分类号	H04R1/14
代理机构		代理人
主权项
地址

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