Dull bit indicator,申请号US19490075708-传众专利搜索

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发明名称	Dull bit indicator
摘要
申请公布号	US2549278(A)	申请公布日期	1951.04.17
申请号	US19490075708	申请日期	1949.02.10
申请人	YANCEY JOHN R	发明人	YANCEY JOHN R.
分类号	E21B12/02	主分类号	E21B12/02
代理机构		代理人
主权项
地址

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