Demountable rock bit,申请号US19380246643-传众专利搜索

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发明名称	Demountable rock bit
摘要
申请公布号	US2182903(A)	申请公布日期	1939.12.12
申请号	US19380246643	申请日期	1938.12.19
申请人	W. K. P. OIL TOOL CO.	发明人	PHIPPS JOHN T.
分类号	E21B10/10	主分类号	E21B10/10
代理机构		代理人
主权项
地址

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