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发明名称
DOOR PRE-LIFT DEVICE
摘要
申请公布号
CA392497(A)
申请公布日期
1940.11.12
申请号
CAD392497
申请日期
申请人
TRUSCON STEEL COMPANY
发明人
DAVID H. MORGAN
分类号
主分类号
代理机构
代理人
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