Tunnelling method and apparatus,申请号US19640351491-传众专利搜索

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发明名称	Tunnelling method and apparatus
摘要
申请公布号	US3280572(A)	申请公布日期	1966.10.25
申请号	US19640351491	申请日期	1964.03.12
申请人	HATTON PATRICIA L	发明人	HATTON PATRICIA L.
分类号	E21D19/04	主分类号	E21D19/04
代理机构		代理人
主权项
地址

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