TRENCH EXCAVATION METHOD BY MAKING USE OF LIQUID JET AND DEVICE,申请号JP19900050056-传众专利搜索

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发明名称	TRENCH EXCAVATION METHOD BY MAKING USE OF LIQUID JET AND DEVICE
摘要
申请公布号	JPH03253690(A)	申请公布日期	1991.11.12
申请号	JP19900050056	申请日期	1990.03.01
申请人	ELECTRIC POWER DEV CO LTD;OSANAI YUTAKA;KAIHATSU KOUJI KK;JAPAN STEEL WORKS LTD:THE	发明人	OSHITANI KOJI;MIYANAGA YOSHIHARU
分类号	E21B7/16;E21B7/18	主分类号	E21B7/16
代理机构		代理人
主权项
地址

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