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发明名称
Railroad frog
摘要
申请公布号
US2110633(A)
申请公布日期
1938.03.08
申请号
US19350055479
申请日期
1935.12.20
申请人
MICHAEL PIKARCHUK;LINA PIKARCHUK
发明人
PIKARCHUK MICHAEL;PIKARCHUK LINA
分类号
E01B7/14
主分类号
E01B7/14
代理机构
代理人
主权项
地址
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