COUNTERBALANCING DEVICE FOR ROLL SUPPORTED DOORS,申请号CAD301091-传众专利搜索

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发明名称	COUNTERBALANCING DEVICE FOR ROLL SUPPORTED DOORS
摘要
申请公布号	CA301091(A)	申请公布日期	1930.06.17
申请号	CAD301091	申请日期
申请人	CHARLES M. EVANS	发明人	CHARLES M. EVANS
分类号		主分类号
代理机构		代理人
主权项
地址

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