Oppositely rotating propellers,申请号US19390278860-传众专利搜索

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发明名称	Oppositely rotating propellers
摘要
申请公布号	US2470560(A)	申请公布日期	1949.05.17
申请号	US19390278860	申请日期	1939.06.13
申请人	HOOVER WALTER S	发明人	HOOVER WALTER S.
分类号	B64C11/30	主分类号	B64C11/30
代理机构		代理人
主权项
地址

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