Well surveying instrument,申请号US19450629729-传众专利搜索

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发明名称	Well surveying instrument
摘要
申请公布号	US2450060(A)	申请公布日期	1948.09.28
申请号	US19450629729	申请日期	1945.11.20
申请人	SPERRY-SUN WELL SURVEYING COMPANY	发明人	RING ROLAND
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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