HAMMER DRILLS FOR MAKING BOREHOLES,申请号US19900486939-传众专利搜索

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发明名称	HAMMER DRILLS FOR MAKING BOREHOLES
摘要
申请公布号	US5115875(A)	申请公布日期	1992.05.26
申请号	US19900486939	申请日期	1990.03.01
申请人	ENNIS, MELVYN S. J.	发明人	ENNIS, MELVYN S. J.
分类号	E21B4/14;E21B10/38;E21B21/12;E21B21/16	主分类号	E21B4/14
代理机构		代理人
主权项
地址

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