Underreamer,申请号GB19280036170-传众专利搜索

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发明名称	Underreamer
摘要
申请公布号	GB302900(A)	申请公布日期	1930.02.06
申请号	GB19280036170	申请日期	1928.12.07
申请人	JOHN GRANT	发明人
分类号	E21B10/32	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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