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经营范围
发明名称
Railway hatch cover and locking means therefor
摘要
申请公布号
US2372369(A)
申请公布日期
1945.03.27
申请号
US19440525778
申请日期
1944.03.09
申请人
THE YOUNGSTOWN STEEL DOOR COMPANY
发明人
DITCHFIELD FRANK
分类号
B61D7/00
主分类号
B61D7/00
代理机构
代理人
主权项
地址
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