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发明名称
DEVICES FOR SPREADING AND PLACING BALLAST UNDER RAILROAD TRACKS
摘要
申请公布号
CA527965(A)
申请公布日期
1956.07.17
申请号
CAD527965
申请日期
申请人
MANNIX LTD.
发明人
LOUIS B. FRANCO
分类号
主分类号
代理机构
代理人
主权项
地址
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