Instrument for measuring smoke density,申请号GB19330008791-传众专利搜索

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发明名称	Instrument for measuring smoke density
摘要
申请公布号	GB414817(A)	申请公布日期	1934.08.16
申请号	GB19330008791	申请日期	1933.03.23
申请人	JOHN SWITZER OWENS	发明人
分类号	G01N21/29	主分类号	G01N21/29
代理机构		代理人
主权项
地址

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