DEVICE FOR PREVENTING SPRING WATER AND SEDIMENT FROM FLOWING IN AT EXTRACTION OF CASING DURING DRILLING OF HIGH SPRING WATER PRESSURE GROUND,申请号JP19900248637-传众专利搜索

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发明名称	DEVICE FOR PREVENTING SPRING WATER AND SEDIMENT FROM FLOWING IN AT EXTRACTION OF CASING DURING DRILLING OF HIGH SPRING WATER PRESSURE GROUND
摘要
申请公布号	JPH04128492(A)	申请公布日期	1992.04.28
申请号	JP19900248637	申请日期	1990.09.20
申请人	NITTOC CONSTR CO LTD	发明人	OKADA YASUHIRO;SUGA KOICHI
分类号	E21B23/00;E21B33/10	主分类号	E21B23/00
代理机构		代理人
主权项
地址

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