Soundproof ear appliance,申请号US19460709605-传众专利搜索

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发明名称	Soundproof ear appliance
摘要
申请公布号	US2476589(A)	申请公布日期	1949.07.19
申请号	US19460709605	申请日期	1946.11.13
申请人	DRISKILL DALLAS B	发明人	DRISKILL DALLAS B.
分类号	A61F11/14	主分类号	A61F11/14
代理机构		代理人
主权项
地址

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