Improvements in or relating to gradient indicators,申请号GB19370002914-传众专利搜索

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发明名称	Improvements in or relating to gradient indicators
摘要
申请公布号	GB489706(A)	申请公布日期	1938.08.02
申请号	GB19370002914	申请日期	1937.02.01
申请人	FREDERIC STROTHMANN	发明人
分类号	G01C9/22	主分类号	G01C9/22
代理机构		代理人
主权项
地址

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