Tunneling and excavation through rock by core forming and removal,申请号US19640418676-传众专利搜索

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发明名称	Tunneling and excavation through rock by core forming and removal
摘要
申请公布号	US3325217(A)	申请公布日期	1967.06.13
申请号	US19640418676	申请日期	1964.12.16
申请人	KARL A. ENZ	发明人	ENZ ROBERT W.
分类号	E21D9/10	主分类号	E21D9/10
代理机构		代理人
主权项
地址

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