Well drilling shock absorber,申请号US19650476358-传众专利搜索

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发明名称	Well drilling shock absorber
摘要
申请公布号	US3323326(A)	申请公布日期	1967.06.06
申请号	US19650476358	申请日期	1965.08.02
申请人	VERTSON JOHN A	发明人	VERTSON JOHN A.
分类号	E21B17/07	主分类号	E21B17/07
代理机构		代理人
主权项
地址

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