Controlling device for fire doors,申请号US19400367028-传众专利搜索

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发明名称	Controlling device for fire doors
摘要
申请公布号	US2283537(A)	申请公布日期	1942.05.19
申请号	US19400367028	申请日期	1940.11.25
申请人	RICHARD D. WARD	发明人	BURNHAM PHILIP W.
分类号	A62C2/18	主分类号	A62C2/18
代理机构		代理人
主权项
地址

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