FORMING A PASSAGEWAY THROUGH THE GROUND,申请号US19900620461-传众专利搜索

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发明名称	FORMING A PASSAGEWAY THROUGH THE GROUND
摘要
申请公布号	US5129760(A)	申请公布日期	1992.07.14
申请号	US19900620461	申请日期	1990.11.29
申请人	AEB JACKED STRUCTURES LIMITED	发明人	ROPKINS, JOHN W. T.
分类号	E21D9/00	主分类号	E21D9/00
代理机构		代理人
主权项
地址

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