Prelift device for hangar doors,申请号US19390261596-传众专利搜索

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发明名称	Prelift device for hangar doors
摘要
申请公布号	US2220656(A)	申请公布日期	1940.11.05
申请号	US19390261596	申请日期	1939.03.13
申请人	TRUSCON STEEL COMPANY	发明人	MORGAN DAVID H.
分类号	E06B3/52	主分类号	E06B3/52
代理机构		代理人
主权项
地址

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