Bit passage plug inserts and bit with plugged passages,申请号US19570679620-传众专利搜索

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发明名称	Bit passage plug inserts and bit with plugged passages
摘要
申请公布号	US2987130(A)	申请公布日期	1961.06.06
申请号	US19570679620	申请日期	1957.08.22
申请人	WILLIAM E. FORD	发明人	MCINTYRE WILLIAM D.
分类号	E21B10/18	主分类号	E21B10/18
代理机构		代理人
主权项
地址

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