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发明名称
Double slope re-railing frog
摘要
申请公布号
US1827220(A)
申请公布日期
1931.10.13
申请号
US19280319243
申请日期
1928.11.14
申请人
BRYANT RODERICK W
发明人
BRYANT RODERICK W.
分类号
B61K5/06
主分类号
B61K5/06
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代理人
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地址
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