Drift measuring and recording apparatus,申请号US19300480346-传众专利搜索

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发明名称	Drift measuring and recording apparatus
摘要
申请公布号	US1928644(A)	申请公布日期	1933.10.03
申请号	US19300480346	申请日期	1930.09.08
申请人	TECHNICAL OIL TOOL CORPORATION, LTD.	发明人	BUNKER FRANK S.
分类号	E21B47/022	主分类号	E21B47/022
代理机构		代理人
主权项
地址

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