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发明名称
Iron sleeper
摘要
申请公布号
US1874987(A)
申请公布日期
1932.08.30
申请号
US19320594900
申请日期
1932.02.24
申请人
FRIED. KRUPP AKTIENGESELLSCHAFT
发明人
HARTMANN FRITZ
分类号
E01B3/16
主分类号
E01B3/16
代理机构
代理人
主权项
地址
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