Testing unit providing a teaching aid for the demonstration of chemistry experimentsto students,申请号US19560560309-传众专利搜索

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发明名称	Testing unit providing a teaching aid for the demonstration of chemistry experimentsto students
摘要
申请公布号	US2845722(A)	申请公布日期	1958.08.05
申请号	US19560560309	申请日期	1956.01.20
申请人	MIDGLEY CALVIN P	发明人	MIDGLEY CALVIN P.
分类号	G09B23/24	主分类号	G09B23/24
代理机构		代理人
主权项
地址

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