Ear piece fitting and valve,申请号US19520278460-传众专利搜索

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发明名称	Ear piece fitting and valve
摘要
申请公布号	US2754519(A)	申请公布日期	1956.07.17
申请号	US19520278460	申请日期	1952.03.25
申请人	PROTECTEARS, INC.	发明人	KINDEL ELMORE A.
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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