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发明名称
Railway tie
摘要
申请公布号
US1784901(A)
申请公布日期
1930.12.16
申请号
US19290377578
申请日期
1929.07.11
申请人
KLINGENSMITH FRANK L
发明人
KLINGENSMITH FRANK L.
分类号
E01B3/32
主分类号
E01B3/32
代理机构
代理人
主权项
地址
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