Dust filter mask,申请号US19540450770-传众专利搜索

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发明名称	Dust filter mask
摘要
申请公布号	US2868196(A)	申请公布日期	1959.01.13
申请号	US19540450770	申请日期	1954.08.18
申请人	OTTO HEINRICH DRAGER	发明人	STAMPE GERHARD K. E. H.
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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