Respiratory face mask,申请号US19570644077-传众专利搜索

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发明名称	Respiratory face mask
摘要
申请公布号	US2891540(A)	申请公布日期	1959.06.23
申请号	US19570644077	申请日期	1957.03.05
申请人	OTTO HEINRICH DRAGER	发明人	TIETZE HERMANN
分类号	A62B18/02	主分类号	A62B18/02
代理机构		代理人
主权项
地址

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