Air lock method of increasing tunnel capacities,申请号US19300430092-传众专利搜索

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发明名称	Air lock method of increasing tunnel capacities
摘要
申请公布号	US1829525(A)	申请公布日期	1931.10.27
申请号	US19300430092	申请日期	1930.02.20
申请人	DOHERTY RESEARCH COMPANY	发明人	JR. CHARLES A. LEE,
分类号	E03B7/07	主分类号	E03B7/07
代理机构		代理人
主权项
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