DRILLING STRING SHOCK-ABSORBING TOOL,申请号CA19770277084-传众专利搜索

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发明名称	DRILLING STRING SHOCK-ABSORBING TOOL
摘要
申请公布号	CA1030520(A)	申请公布日期	1978.05.02
申请号	CA19770277084	申请日期	1977.04.27
申请人	LEE-MASON TOOLS LTD.	发明人	MASON, LEONARD;ANDERSON, CLIFFORD
分类号	E21B17/04	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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