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发明名称
Method and apparatus for working railroad ballast
摘要
申请公布号
US2575390(A)
申请公布日期
1951.11.20
申请号
US19460693096
申请日期
1946.08.26
申请人
MCFADDEN JOHN H
发明人
MCFADDEN JOHN H.
分类号
E01B27/02
主分类号
E01B27/02
代理机构
代理人
主权项
地址
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