Silent dictation mask,申请号US19540447724-传众专利搜索

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发明名称	Silent dictation mask
摘要
申请公布号	US2831070(A)	申请公布日期	1958.04.15
申请号	US19540447724	申请日期	1954.08.04
申请人	THE SOUNDSCRIBER CORPORATION	发明人	SHERWOOD HENRY A.
分类号	H04R1/08	主分类号	H04R1/08
代理机构		代理人
主权项
地址

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