Deep well drilling device,申请号US19460704213-传众专利搜索

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发明名称	Deep well drilling device
摘要
申请公布号	US2496954(A)	申请公布日期	1950.02.07
申请号	US19460704213	申请日期	1946.10.18
申请人	VICTOR PRASSEL	发明人	PRASSEL VICTOR
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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