DRILL PIPE/CASING PROTECTOR AND METHOD,申请号US19900523763-传众专利搜索

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发明名称	DRILL PIPE/CASING PROTECTOR AND METHOD
摘要
申请公布号	US5069297(A)	申请公布日期	1991.12.03
申请号	US19900523763	申请日期	1990.05.15
申请人	RUDOLPH E. KRUEGER, INC.	发明人	KRUEGER, DECEASED, R. ERNST;KRUEGER, WILLIAM E.
分类号	E21B17/10;F16L57/00	主分类号	E21B17/10
代理机构		代理人
主权项
地址

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