Drill bit and method of making the same,申请号US19310557086-传众专利搜索

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发明名称	Drill bit and method of making the same
摘要
申请公布号	US1929608(A)	申请公布日期	1933.10.10
申请号	US19310557086	申请日期	1931.08.14
申请人	ECONOMY ROCK BIT CORPORATION	发明人	REA WALTER C.
分类号	B21K5/06	主分类号	B21K5/06
代理机构		代理人
主权项
地址

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