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经营范围
发明名称
Rail heating device
摘要
申请公布号
US1991801(A)
申请公布日期
1935.02.19
申请号
US19300486897
申请日期
1930.10.07
申请人
GREENFIELD WILLIAM H
发明人
GREENFIELD WILLIAM H.
分类号
E01B7/24
主分类号
E01B7/24
代理机构
代理人
主权项
地址
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