Method of and apparatus for constructing concrete tunnels,申请号US19370128127-传众专利搜索

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发明名称	Method of and apparatus for constructing concrete tunnels
摘要
申请公布号	US2144013(A)	申请公布日期	1939.01.17
申请号	US19370128127	申请日期	1937.02.27
申请人	MASON & HANGER CO., INC.	发明人	DONALDSON FRANCIS
分类号	E21D11/10	主分类号	E21D11/10
代理机构		代理人
主权项
地址

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