An improved method of driving pipes through the ground,申请号GB19620015502-传众专利搜索

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发明名称	An improved method of driving pipes through the ground
摘要
申请公布号	GB999822(A)	申请公布日期	1965.07.28
申请号	GB19620015502	申请日期	1962.04.24
申请人	ERIK HERMAN BERGSTROM	发明人
分类号	E21B7/04	主分类号	E21B7/04
代理机构		代理人
主权项
地址

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