Improvements in spirit levels,申请号GB19300006623-传众专利搜索

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发明名称	Improvements in spirit levels
摘要
申请公布号	GB345456(A)	申请公布日期	1931.03.26
申请号	GB19300006623	申请日期	1930.02.28
申请人	FREDERIC SMALLWOOD	发明人
分类号	G01C9/24;G01C9/34	主分类号	G01C9/24
代理机构		代理人
主权项
地址

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