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发明名称
Heating device for railroad rails and switches
摘要
申请公布号
US1952589(A)
申请公布日期
1934.03.27
申请号
US19300471735
申请日期
1930.07.30
申请人
ERNST L. RUBY
发明人
GUENST WILLIAM
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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