Rotary drill bits and cutters,申请号US19560589987-传众专利搜索

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发明名称	Rotary drill bits and cutters
摘要
申请公布号	US2922627(A)	申请公布日期	1960.01.26
申请号	US19560589987	申请日期	1956.06.07
申请人	ROTARY OIL TOOL COMPANY	发明人	KAMMERER ARCHER W.
分类号	E21B10/32;E21B29/00	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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