Improvements in and relating to counter-running double or multiple propellers in media of all kinds,申请号GB19310020861-传众专利搜索

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发明名称	Improvements in and relating to counter-running double or multiple propellers in media of all kinds
摘要
申请公布号	GB382297(A)	申请公布日期	1932.10.21
申请号	GB19310020861	申请日期	1931.07.21
申请人	FRANZ MELCHER	发明人
分类号	B63H5/10	主分类号	B63H5/10
代理机构		代理人
主权项
地址

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