Bit with cutters having scraping and rolling motions,申请号US19290381704-传众专利搜索

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发明名称	Bit with cutters having scraping and rolling motions
摘要
申请公布号	US1859948(A)	申请公布日期	1932.05.24
申请号	US19290381704	申请日期	1929.07.29
申请人	ZUBLIN JOHN A	发明人	ZUBLIN JOHN A.
分类号	E21B10/08;E21B10/16;E21B10/20;E21B10/22	主分类号	E21B10/08
代理机构		代理人
主权项
地址

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