PITCH CHANGEABLE ROTARY ROCK BIT,申请号JP19790057953-传众专利搜索

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发明名称	PITCH CHANGEABLE ROTARY ROCK BIT
摘要
申请公布号	JPS54149303(A)	申请公布日期	1979.11.22
申请号	JP19790057953	申请日期	1979.05.11
申请人	DRESSER IND	发明人	FURANSHISU YUUJIN FUERUPUSU
分类号	E21B10/16;E21B10/52	主分类号	E21B10/16
代理机构		代理人
主权项
地址

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