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发明名称
摘要
申请公布号	JPH0119035(B2)	申请公布日期	1989.04.10
申请号	JP19810159473	申请日期	1981.10.08
申请人	HITACHI CONSTRUCTION MACHINERY	发明人	KUBOTA MASAYOSHI;NISHITANI TADASHI;INAGAKI KATSUHIRO
分类号	E21B11/00	主分类号	E21B11/00
代理机构		代理人
主权项
地址

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