Check valve and packing seal placed at the cutting head of hammer drills,申请号IT1991GE00144-传众专利搜索

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发明名称	Check valve and packing seal placed at the cutting head of hammer drills
摘要
申请公布号	IT1253717(B)	申请公布日期	1995.08.23
申请号	IT1991GE00144	申请日期	1991.11.07
申请人		发明人
分类号	E21B;(IPC1-7):E21B	主分类号	E21B
代理机构		代理人
主权项
地址

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