Shear relief check valve for flushing passageways of earth penetrating tools,申请号US19620234664-传众专利搜索

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发明名称	Shear relief check valve for flushing passageways of earth penetrating tools
摘要
申请公布号	US3213949(A)	申请公布日期	1965.10.26
申请号	US19620234664	申请日期	1962.11.01
申请人	HUGHES TOOL COMPANY	发明人	JR. WILLIAM A. KISTLER,
分类号	E21B10/60;E21B10/61;E21B10/62;E21B21/10	主分类号	E21B10/60
代理机构		代理人
主权项
地址

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