DOWN-HOLE DRILLING HAMMER,申请号USD3606930-传众专利搜索

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发明名称	DOWN-HOLE DRILLING HAMMER
摘要
申请公布号	US3606930(A)	申请公布日期	1971.09.21
申请号	USD3606930	申请日期	1969.10.06
申请人	BAKER OIL TOOLS INC.	发明人	ALFRED R. CURINGTON
分类号	E21B4/14;(IPC1-7):E21B1/06	主分类号	E21B4/14
代理机构		代理人
主权项
地址

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