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发明名称
Railroad switch stand dog
摘要
申请公布号
US1835442(A)
申请公布日期
1931.12.08
申请号
US19310531877
申请日期
1931.04.22
申请人
PETER SWANSON
发明人
SWANSON PETER
分类号
B61L5/02
主分类号
B61L5/02
代理机构
代理人
主权项
地址
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