Culvert and method of protecting the same,申请号US19320625457-传众专利搜索

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发明名称	Culvert and method of protecting the same
摘要
申请公布号	US1970670(A)	申请公布日期	1934.08.21
申请号	US19320625457	申请日期	1932.07.28
申请人	NIXON ROBERT R	发明人	NIXON ROBERT R.
分类号	E01F5/00	主分类号	E01F5/00
代理机构		代理人
主权项
地址

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