Acoustic apparatus for the deaf,申请号US19370169045-传众专利搜索

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发明名称	Acoustic apparatus for the deaf
摘要
申请公布号	US2230397(A)	申请公布日期	1941.02.04
申请号	US19370169045	申请日期	1937.10.14
申请人	CROWFORD ABRAHAM LEWIS	发明人	ABRAHAM LEWIS CROWFORD
分类号	A61F11/04	主分类号	A61F11/04
代理机构		代理人
主权项
地址

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