Visibility threshold device for indicating changes in the oxygen content of air,申请号US19470794747-传众专利搜索

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发明名称	Visibility threshold device for indicating changes in the oxygen content of air
摘要
申请公布号	US2506591(A)	申请公布日期	1950.05.09
申请号	US19470794747	申请日期	1947.12.30
申请人	CURTIS HARTLEY JOHN	发明人	HARTLEY JOHN CURTIS
分类号	G01N21/72	主分类号	G01N21/72
代理机构		代理人
主权项
地址

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