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发明名称
Railway roadbed
摘要
申请公布号
US2133227(A)
申请公布日期
1938.10.11
申请号
US19380188120
申请日期
1938.02.01
申请人
PETE JARNOWSKI
发明人
JARNOWSKI PETE
分类号
E01B9/28;E01C9/06
主分类号
E01B9/28
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代理人
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